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FERMIGBRST - Fermi GBM Burst Catalog

HEASARC
Archive

Overview

This table lists all of the triggers observed by a subset of the 14 GBM detectors (12 NaI and 2 BGO) which have been classified as gamma-ray bursts (GRBs). Note that there are two Browse catalogs resulting from GBM triggers. All GBM triggers are entered in the Fermi GBM Trigger Catalog, while only those triggers classified as bursts are entered in the Burst Catalog. Thus, a burst will be found in both the Trigger and Burst Catalogs. The Burst Catalog analysis requires human intervention; therefore, GRBs will be entered in the Trigger Catalog before the Burst Catalog. The latency requirements are 1 day for triggers and 3 days for bursts. There are four fewer bursts in the online catalog than in the Gruber et al. 2014 paper. The four missing events (081007224, 091013989, 091022752, and 091208623) have not been classified with certainty as GRBs and are not included in the general GRB catalog. This classification may be revised at a later stage.

The GBM consists of an array of 12 sodium iodide (NaI) detectors which cover the lower end of the energy range up to 1 MeV. The GBM triggers off of the rates in the NaI detectors, with some Terrestrial Gamma-ray Flash (TGF)-specific algorithms using the bismuth germanate (BGO) detectors, sensitive to higher energies, up to 40 MeV. The NaI detectors are placed around the Fermi spacecraft with different orientations to provide the required sensitivity and FOV. The cosine-like angular response of the thin NaI detectors is used to localize burst sources by comparing rates from detectors with different viewing angles. The two BGO detectors are placed on opposite sides of the spacecraft so that all sky positions are visible to at least one BGO detector.

The signals from all 14 GBM detectors are collected by a central Data Processing Unit (DPU). This unit digitizes and time-tags the detectors' pulse height signals, packages the resulting data into several different types for transmission to the ground (via the Fermi spacecraft), and performs various data processing tasks such as autonomous burst triggering.

The GRB science products are transmitted to the FSSC in two types of files. The first file, called the "bcat" file, provides basic burst parameters such as duration, peak flux and fluence, calculated from 8-channel data using a spectral model which has a power-law in energy that falls exponentially above an energy EPeak, known as the Comptonized model. The crude 8-channel binning and the simple spectral model allow data fits in batch mode over numerous time bins in an efficient and robust fashion, including intervals with little or no flux, yielding both values for the burst duration, and deconvolved lightcurves for the detectors included in the fit. The bcat file includes two extensions. The first, containing detailed information about energy channels and detectors used in the calculations, is detector-specific, and includes the time history of the deconvolved flux over the time intervals of the burst. The second shows the evolution of the spectral parameters obtained in a joint fit of the included detectors for the model used, usually the Comptonized model described above. The bcat files and their time-varying quantities contained in these two extensions are available at the HEASARC FTP site. Quantities derived from these batch fits are given in the bcat primary header and presented in the Browse table, as described below. The main purpose of the analysis contained in the bcat file is to produce a measure of the duration of the burst after deconvolving the instrument response. The duration quantities are:

 * 't50' - the time taken to accumulate 50% of the burst fluence starting at the 25% fluence level.
 * 't90' - the time taken to accumulate 90% of the burst fluence starting at the 5% fluence level.
By-products of this analysis include fluxes on various timescales and fluences, both obtained using the simple Comptonized model described above. These quantities are detailed in the Browse table using the following prefixes:
 * 'flux' - the peak flux over 3 different timescales obtained in the batch mode fit used to calculate t50/t90.
 * 'fluence' - the total fluence accumulated in the t50/t90 calculation.
The fluxes and fluences derived from the 8-channel data for these bcat files should be considered less reliable than those in the spectral analysis files described below.

Analysis methods used in obtaining these quantities are detailed in the first GBM GRB Catalog (Paciesas et al. 2011). Updates of bcat files will be sent (with new version numbers) as these parameters are refined. This "bcat" file is produced for triggers that are classified as GRBs (with exceptions as described below), and supplements the initial data in the trigger or "tcat" file that is produced for all triggers.

The second type of file (the spectrum or "scat" file) provides parameter values and goodness-of-fit measures for different types of spectral fits and models. These fits are performed using 128-channel data, either CSPEC or, for short bursts, TTE data. The type and model are coded into the filename. There are currently two spectrum categories:

 * Peak flux ('pflx') - a single spectrum over the time range of the peak flux of the burst
 * Fluence ('flnc') - a single spectrum over the entire burst duration selected by the duty scientist.
Like the bcat files, the scat files have two extensions. The first extension gives detector-specific information, including photon fluxes and fluences for each detector, which are provided for each energy channel. The second extension provides derived quantities such as flux, fluence and model parameters for the joint fit of all included detectors. The scat files and their energy-resolved quantities contained in these two extensions are available in the Fermi data archive at the HEASARC. Quantities derived from these spectral fits are available in the Browse table, as described below and in Goldstein et al. (2011).

The spectra are fit with a number of models, with the signal-to-noise ratio of the spectrum often determining whether a more complex model is statistically favored. The current set is:

 * Power law ('plaw'),
 * Comptonized (exponentially attenuated power law; 'comp')
 * Band ('band')
 * Smoothly broken power law ('sbpl')

Warnings

The bcat and scat files result from two completely independent analyses, and consequently, it is possible that the same quantities might show differences. Indeed,

1) the fluxes and fluences in the "scat" files should be considered more reliable than those in the "bcat" files, with the official fluxes and fluences being those yielded by the statistically favored model ("Best_Fitting_Model" in the Browse table) and with the full energy resolution of the instrument;

2) in both the bcat and scat analyses, the set of detectors used for the fits ("Scat_Detector_Mask" in the Browse table) may not be the same as the set of detectors that triggered GBM ("Bcat_Detector_Mask" in the Browse table);

3) background definitions are different for the bcat and scat analysis (see references below).

Finally, for weak events, it is not always possible to perform duration or spectral analyses, and some bursts occur too close in time to South Atlantic Anomaly entries or exits by Fermi with resultant data truncations that prevent background determinations for the duration analysis. There is not an exact one-to-one correspondence between those events for which the duration analysis fails and those which are too weak to have a useful spectral characterization. This means that in the HEASARC Browse table there are a handful of GRBs which have duration parameters but not spectral fit parameters, and vice versa. In these cases, blank entries in the table indicate missing values where an analysis was not possible. Values of 0.0 for the uncertainties on spectral parameters indicate those parameters have been fixed in the fit from which other parameters or quantities in the table were derived. Missing values for model fit parameters indicate that the fit failed to converge for this model. This is true mostly for the more complicated models (SBPL or BAND) when the fits fail to converge for weaker bursts. Bad spectral fits can often result in unphysical flux and fluence values with undefined errors. We include these bad fits but leave the error fields blank when they contain undefined values. The selection criteria used in the first catalog (Goldstein et al. 2011) for the determination of the best-fit spectral model are different from those in the current catalog (Gruber et al. 2014). The results using the two methods on the sample included in Goldstein et al. (2011) are compared in Gruber et al. (2014). The old catalog files can be retrieved using the HEASARC ftp archive tree, under "previous" directories. The values returned by Browse always come from the "current" directories. The chi-squared statistic was not used in the 2nd catalog, either for parameter optimization or model comparison. The chi-squared values are missing for a few GRBs. This is believed to be because of a known software issue and should not be considered indicative of a bad fit.

The variable "scatalog" included in the Browse tables and in the FITS files indicates which catalog a file belongs to, with 2 being the current catalog, and 1 (or absent) the first catalog (preliminary values may appear with value 0).


Bulletin

The FERMIGBRST database table was last updated on 26 November 2014.

Caveats

Please see the warnings on the GBM Caveats page, http://fermi.gsfc.nasa.gov/ssc/data/analysis/GBM_caveats.html.

References

 * The current (second) general catalog is described in von Kienlin, A. et al. 2014.
 * The current (second) spectral catalog is described in Gruber, D. et al. 2014.
 * The first general catalog is described in Paciesas, W.S. et al. 2011, ApJS, 199, 18.
 * The first spectral catalog is described in Goldstein, A. et al. 2011, ApJS, 199, 19.
Also, see the Fermi Science Data Product Interface Control Document.

Provenance

The information in this table is provided by the Fermi Gamma-ray Burst Monitor Instrument Operations Center (GIOC) and the Fermi Science Support Center (FSSC). The values come from burst and spectral catalog entry FITS files provided by the GIOC to the FSSC. These FITS files may contain additional data and are available for download. This table is updated automatically within a day or so of new data files being processed and made available.

Parameters

Trigger_Name
The Fermi trigger designation that is assigned for each new trigger detected. The name is the same as the one used in the Trigger Catalog. The naming scheme used is bnyymmddfff, where yymmdd is the date of the burst (yy, the year minus 2000; mm, the two-digit month; and dd, the two-digit day of the month) and fff = fraction of day.

Name
The designation of the source of the burst. The name will initially be GRByymmddfff, where yymmdd is the 2-digit year, month and day of the burst and fff the fraction of the day, as assigned by pipeline processing. The name will eventually be changed to the GRByymmddx format, where x is null or 'A' or 'B' etc. Re-naming to this format requires human intervention, noting whether another burst was detected on the same day.

RA
The Right Ascension of the burst in the selected equinox. This was given in J2000 decimal degree coordinates in the original data.

Dec
The Declination of the burst in the selected equinox. This was given in J2000 decimal degree coordinates in the original data.

LII
The Galactic Longitude of the burst, derived from the burst RA and Dec.

BII
The Galactic Latitude of the burst, derived from the burst RA and Dec.

Error_Radius
This parameter is the uncertainty in the position, in degrees. A value of 0 means that the source localization was done using something other than Fermi GBM (for example, Swift, XMM, Chandra, etc.), so that the error radius is negligible by GBM standards. A value of 50 means that the localization is not well determined.

Trigger_Time
The time at which the trigger occurred, originally provided in Fermi Mission Elapsed Time (MET) format and converted to UTC.

Duration_Energy_Low
The lower limit of duration integration, in keV. This is a parameter, nominally 50 keV.

Duration_Energy_High
The upper limit of duration integration, in keV. This is a parameter, nominally 300 keV.

Back_Interval_Low_Start
The start of the pre-burst background interval (in seconds relative to trigger time) used as a plateau for the duration calculation. This value might not be used for the spectral analysis.

Back_Interval_Low_Stop
The end of the pre-burst background interval (in seconds relative to trigger time) used as a plateau for the duration calculation. This value might not be used for the spectral analysis.

Back_Interval_High_Start
The start of the post-burst background interval (in seconds relative to trigger time) used as a plateau for the duration calculation. This value might not be used for the spectral analysis.

Back_Interval_High_Stop
The end of the post-burst background interval (in seconds relative to trigger time) used as a plateau for the duration calculation. This value might not be used for the spectral analysis.

T50
The duration, in seconds, during which 50% of the burst fluence was accumulated. The start of the T50 interval is defined by the time at which 25% of the total fluence has been detected, and the end of the T50 interval is defined by the time at which 75% of the fluence been detected. The fluence for the T50 calculation is measured between duration_energy_low and duration_energy_high.

T50_Error
The 1-sigma statistical uncertainty in the T50 duration.

T50_Start
The start of the T50 interval (in seconds) relative to the trigger time.

T90
The duration, in seconds, during which 90% of the burst fluence was accumulated. The start of the T90 interval is defined by the time at which 5% of the total fluence has been detected, and the end of the T90 interval is defined by the time at which 95% of the fluence been detected. The fluence for the T90 calculation is measured between duration_energy_low and duration_energy_high.

T90_Error
The 1-sigma statistical uncertainty in the T90 duration.

T90_Start
The start of T90 interval (in seconds) relative to the trigger time.

Bcat_Detector_Mask
A mask, or string of 14 boolean flags (either '0' or 1'), that indicates which detectors were included in the fits for the duration calculation, with '1' representing inclusion. The mask reads from left to right: NaI 0 to NaI 11, then BGO 0 and 1.

Flu_Low
The lower limit of flux/fluence integration, in keV. This is a parameter, nominally 10 keV.

Flu_High
The upper limit of flux/fluence integration, in keV. This is a parameter, nominally 1000 keV.

Fluence
The fluence (flux integrated over the burst duration, 100% level) in the flu_low - flu_high energy band, nominally 10-1000 keV, in erg/cm2.

Fluence_Error
The 1-sigma statistical uncertainty of the fluence in the in the flu_low - flu_high energy band, nominally 10-1000 keV, in erg/cm2.

Fluence_BATSE
The fluence (flux integrated over the burst duration, 100% level) in the BATSE standard 50-300 keV energy band, in erg/cm2.

Fluence_BATSE_Error
The 1-sigma statistical uncertainty of the fluence in the BATSE standard 50-300 keV energy band, in erg/cm2.

Flux_1024
The peak flux in the flu_low - flu_high energy band, nominally 10-1000 keV, (1024ms timescale).

Flux_1024_Error
The 1-sigma statistical uncertainty in the in the flu_low - flu_high energy band, nominally 10-1000 keV, peak flux (1024ms timescale).

Flux_1024_Time
The start time (in seconds relative to trigger time) of the interval for the peak flux (1024 ms timescale) in the flu_low - flu_high energy band, nominally 10-1000 keV.

Flux_64
The peak flux in the flu_low - flu_high energy band, nominally 10-1000 keV, (64ms timescale).

Flux_64_Error
The 1-sigma statistical uncertainty in the in the flu_low - flu_high energy band, nominally 10-1000 keV, peak flux (64ms timescale).

Flux_64_Time
The start time (in seconds relative to trigger time) of the interval for the peak flux (64 ms timescale) in the flu_low - flu_high energy band, nominally 10-1000 keV.

Flux_256
The peak flux in the flu_low - flu_high energy band, nominally 10-1000 keV, (256 ms timescale).

Flux_256_Error
The 1-sigma statistical uncertainty in the in the flu_low - flu_high energy band, nominally 10-1000 keV, peak flux (256 ms timescale).

Flux_256_Time
The start time (in seconds relative to trigger time) of the interval for the peak flux (256 ms timescale) in the flu_low - flu_high energy band, nominally 10-1000 keV.

Flux_BATSE_1024
The peak flux in the BATSE standard 50-300 keV energy band (1024 ms timescale).

Flux_BATSE_1024_Error
The 1-sigma statistical uncertainty in the 50-300 keV peak flux (1024 ms timescale).

Flux_BATSE_1024_Time
The start time (in seconds relative to trigger time) of the interval for the peak flux (1024 ms timescale) in the BATSE standard 50-300 keV energy band.

Flux_BATSE_64
The peak flux in the BATSE standard 50-300 keV energy band (64 ms timescale).

Flux_BATSE_64_Error
The 1-sigma statistical uncertainty in the 50-300 keV peak flux (64 ms timescale).

Flux_BATSE_64_Time
The start time (in seconds relative to trigger time) of the interval for the peak flux (64 ms timescale) in the BATSE standard 50-300 keV energy band.

Flux_BATSE_256
The peak flux in the BATSE standard 50-300 keV energy band (256 ms timescale).

Flux_BATSE_256_Error
The 1-sigma statistical uncertainty in the 50-300 keV peak flux (256 ms timescale).

Flux_BATSE_256_Time
The start time (in seconds relative to trigger time) of the interval for the peak flux (256 ms timescale) in the BATSE standard 50-300 keV energy band.

Actual_64ms_Interval
The actual length of nominal 64ms timescale for peak flux measurement.

Actual_256ms_Interval
The actual length of nominal 256ms timescale for peak flux measurement.

Actual_1024ms_Interval
The actual length of nominal 1024ms timescale for peak flux measurement.

Scat_Detector_Mask
A mask, or string of 14 boolean flags (either '0' or 1'), that indicates which detectors were included in the spectral catalog fits, with '1' representing inclusion. The mask reads from left to right: NaI 0 to NaI 11, then BGO 0 and 1.

Pflx_Spectrum_Start
The start of the interval (in seconds relative to trigger time) used in the spectral fits over the time range of the peak flux of the burst.

Pflx_Spectrum_Stop
The end of the interval (in seconds relative to trigger time) used in the spectral fits over the time range of the peak flux of the burst.

Pflx_Plaw_Ampl
The amplitude of a power law fit to a single spectrum over the time range of the peak flux of the burst, in photon/cm2/s/keV.

Pflx_Plaw_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the power law fit amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_Plaw_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the power law fit amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_Plaw_Pivot
The pivot energy of a power law fit to a single spectrum over the time range of the peak flux of the burst, in keV. This parameter is typically fixed.

Pflx_Plaw_Pivot_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the pivot energy of a power law fit for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Plaw_Pivot_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the pivot energy of a power law fit for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Plaw_Index
The power law index of a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Index_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the power index of a power law fit for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Plaw_Index_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the power index of a power law fit for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Plaw_Phtflux
The photon flux, in photon/cm2/s, for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Phtflux_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s, for the power law peak flux spectrum.

Pflx_Plaw_Phtflnc
The photon fluence, in photon/cm2, for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the power law peak flux spectrum.

Pflx_Plaw_Ergflux
The energy flux, in erg/cm2/s, for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Ergflux_Error
The 1-sigma statistical error on the energy flux, in erg/cm2/s, for the power law peak flux spectrum.

Pflx_Plaw_Ergflnc
The energy fluence in erg/cm2 for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the power law peak flux spectrum.

Pflx_Plaw_Phtfluxb
The photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Phtfluxb_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the power law peak flux spectrum.

Pflx_Plaw_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the power law peak flux spectrum.

Pflx_Plaw_Ergflncb
The energy fluence in erg/cm2 between 50 and 300 keV (BATSE standard) for a power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Plaw_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the power law peak flux spectrum.

Pflx_Plaw_Redchisq
The reduced chi-squared statistic for the power law fit to the peak flux spectrum. This may not be the statistic used to determine the best fit parameters (see pflx_plaw_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the pflx_plaw_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Pflx_Plaw_Redfitstat
The reduced fitting statistic for the power law fit to the peak flux spectrum. This is the value of the statistic used to determine the best fit parameters, specified in pflx_plaw_statistic.

Pflx_Plaw_DoF
The degrees of freedom for the power law fit to the peak flux spectrum.

Pflx_Plaw_Statistic
The statistical merit function for the power law fit to the peak flux spectrum.

Pflx_Comp_Ampl
The amplitude of a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst, in photon/cm2/s/keV.

Pflx_Comp_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Epeak
The peak energy of a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst, in keV.

Pflx_Comp_Epeak_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model peak energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Epeak_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model peak energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Index
The power law index of a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Index_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model power law index for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Index_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model power law index for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Pivot
The pivot energy of a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst, in keV. This parameter is typically fixed.

Pflx_Comp_Pivot_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model pivot energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Pivot_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model pivot energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Comp_Phtflux
The photon flux, in photon/cm2/s, for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Phtflux_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s, for the Comptonized model peak flux spectrum.

Pflx_Comp_Phtflnc
The photon fluence in photon/cm2 for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the Comptonized model peak flux spectrum.

Pflx_Comp_Ergflux
The energy flux, in erg/cm2/s, for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Ergflux_Error
The 1-sigma statistical error on the energy flux, in erg/cm2/s, for the Comptonized model peak flux spectrum.

Pflx_Comp_Ergflnc
The energy fluence in erg/cm2 for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the Comptonized model peak flux spectrum.

Pflx_Comp_Phtfluxb
The photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Phtfluxb_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the Comptonized model peak flux spectrum.

Pflx_Comp_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the Comptonized model peak flux spectrum.

Pflx_Comp_Ergflncb
The energy fluence in erg/cm2 between 50 and 300 keV (BATSE standard) for a Comptonized model fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Comp_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the Comptonized model peak flux spectrum.

Pflx_Comp_Redchisq
The reduced chi-squared statistic for the Comptonized fit to the peak flux spectrum. This may not be the statistic used to determine the best fit parameters (see pflx_comp_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the pflx_comp_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Pflx_Comp_Redfitstat
The reduced fitting statistic for the Comptonized model fit to the peak flux spectrum. This is the value of the statistic used to determine the best fit parameters, specified in pflx_comp_statistic.

Pflx_Comp_DoF
The degrees of freedom for the Comptonized model fit to the peak flux spectrum.

Pflx_Comp_Statistic
The statistical merit function for the Comptonized model fit to the peak flux spectrum.

Pflx_Band_Ampl
The amplitude of a Band function fit to a single spectrum over the time range of the peak flux of the burst, in photon/cm2/s/keV.

Pflx_Band_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Band function amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_Band_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Band function amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_Band_Epeak
The peak energy of a Band function fit to a single spectrum over the time range of the peak flux of the burst, in keV.

Pflx_Band_Epeak_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Band function peak energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Band_Epeak_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Band function peak energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_Band_Alpha
The power law index, alpha, of a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Alpha_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the to the Band function power law, alpha, for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Band_Alpha_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the to the Band function power law, alpha, for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Band_Beta
The power law index, beta, of a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Beta_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the to the Band function power law, beta, for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Band_Beta_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the to the Band function power law, beta, for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_Band_Phtflux
The photon flux, in photon/cm2/s, for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Phtflux_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s, for the Band function peak flux spectrum.

Pflx_Band_Phtflnc
The photon fluence, in photon/cm2, for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the Band function peak flux spectrum.

Pflx_Band_Ergflux
The energy flux, in erg/cm2/s, for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Ergflux_Error
The 1-sigma statistical error on the energy flux, in erg/cm2/s, for the Band function peak flux spectrum.

Pflx_Band_Ergflnc
The energy fluence in erg/cm2 for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the Band function peak flux spectrum.

Pflx_Band_Phtfluxb
The photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Phtfluxb_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the Band function peak flux spectrum.

Pflx_Band_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the Band function peak flux spectrum.

Pflx_Band_Ergflncb
The energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for a Band function fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_Band_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the Band function peak flux spectrum.

Pflx_Band_Redchisq
The reduced chi-squared statistic for the Band function fit to the peak flux spectrum. This may not be the statistic used to determine the best fit parameters (see pflx_band_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the pflx_band_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Pflx_Band_Redfitstat
The reduced fitting statistic for the Band function fit to the peak flux spectrum. This is the value of the statistic used to determine the best fit parameters, specified in pflx_band_statistic.

Pflx_Band_DoF
The degrees of freedom for the Band function fit to the peak flux spectrum.

Pflx_Band_Statistic
The statistical merit function for the Band function fit to the peak flux spectrum.

Pflx_SBPL_Ampl
The amplitude of a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst, in photon/cm2/s/keV.

Pflx_SBPL_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law amplitude for the peak flux spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Pivot
The pivot energy of a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst, in keV. Typically this parameter is fixed.

Pflx_SBPL_Pivot_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law pivot energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Pivot_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law pivot energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Indx1
The 1st power law of a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Indx1_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law 1st power law for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Indx1_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law 1st power law for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Brken
The break energy of a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst, in keV.

Pflx_SBPL_Brken_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law break energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Brken_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law break energy for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Brksc
The break scale of a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst, in keV. Typically, this parameter is fixed.

Pflx_SBPL_Brksc_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law break scale for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Brksc_Neg_Err
The 1-sigma statistical negative error giving the upper bound to the smoothly broken power law break scale for the peak flux spectrum, in keV. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Indx2
The second power law of a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Indx2_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law 2nd power law for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Indx2_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law 2nd power law for the peak flux spectrum. An error of 0.0 implies a fixed parameter.

Pflx_SBPL_Phtflux
The photon flux, in photon/cm2/s, for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Phtflux_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s, for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Phtflnc
The photon fluence in photon/cm2 for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Ergflux
The energy flux, in erg/cm2/s, for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Ergflux_Error
The 1-sigma statistical error on the energy flux, in erg/cm2/s, for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Ergflnc
The energy fluence, in erg/cm2, for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Phtfluxb
The photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Phtfluxb_Error
The 1-sigma statistical error on the photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Ergflncb
The energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for a smoothly broken power law fit to a single spectrum over the time range of the peak flux of the burst.

Pflx_SBPL_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the smoothly broken power law peak flux spectrum.

Pflx_SBPL_Redchisq
The reduced chi-squared statistic for the smoothly broken power law fit to the peak flux spectrum. This may not be the statistic used to determine the best fit parameters (see pflx_sbpl_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the pflx_sbpl_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Pflx_SBPL_Redfitstat
The reduced fitting statistic for the smoothly broken power law fit to the peak flux spectrum. This is the value of the statistic used to determine the best fit parameters, specified in pflx_sbpl_statistic.

Pflx_SBPL_DoF
The degrees of freedom for the smoothly broken power law fit to the peak flux spectrum.

Pflx_SBPL_Statistic
The statistical merit function for the smoothly broken power law fit to the peak flux spectrum.

Pflx_Best_Fitting_Model
The model which best fits the data for a spectrum accumulated over the peak flux of the burst. The determination of the best fitting model compares the values of the likelihood-based statistic CSTAT (or other statistic defined in pflx_xxxx_statistic) among the tested models. The COMP model is preferred over the PLAW model if there is a decrease in 8.58 units of CSTAT. The BAND or SBPL models are preferred over the COMP model if there is a decrease in 11.83 units of CSTAT, then the lower of BAND and SBPL is selected as best. For a model to be selected as best, its parameters must be well-determined, as follows: the low-energy power-law index must be known to at least 0.4 (68% CL); the high-energy power-law index within 1.0; all other parameters within 40% of their value.

Pflx_Best_Model_Redchisq
The reduced chi-squared statistic for the model that provides the best fit to the peak flux spectrum using the parameters optimized using pfl_xxxx_statistic. This is not the statistic used to determine the best fit parameters but is provided as a "goodness-of-fit" estimate for the model.

Flnc_Spectrum_Start
The start of the interval (in seconds relative to trigger time) used in the spectral fits over the duration of the burst.

Flnc_Spectrum_Stop
The end of the interval (in seconds relative to trigger time) used in the spectral fits over the duration of the burst.

Flnc_Plaw_Ampl
The amplitude of a power law fit to a single spectrum over the duration of the burst, in photon/cm2/s/keV.

Flnc_Plaw_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the power law fit amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_Plaw_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the power law fit amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_Plaw_Pivot
The pivot energy of a power law fit to a single spectrum over the duration of the burst, in keV. This parameter is typically fixed.

Flnc_Plaw_Pivot_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the pivot energy of a power law fit for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Plaw_Pivot_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the pivot energy of a power law fit for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Plaw_Index
The power law index of a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Index_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the power index of a power law fit for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Plaw_Index_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the power index of a power law fit for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Plaw_Phtflux
The average photon flux, in photon/cm2/s, for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Phtflux_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s, for the power law fluence spectrum.

Flnc_Plaw_Phtflnc
The photon fluence, in photon/cm2, for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the power law fluence spectrum.

Flnc_Plaw_Ergflux
The average energy flux, in erg/cm2/s, for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Ergflux_Error
The 1-sigma statistical error on the average energy flux, in erg/cm2/s, for the power law fluence spectrum.

Flnc_Plaw_Ergflnc
The energy fluence, in erg/cm2, for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the power law fluence spectrum.

Flnc_Plaw_Phtfluxb
The average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Phtfluxb_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the power law fluence spectrum.

Flnc_Plaw_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the power law fluence spectrum.

Flnc_Plaw_Ergflncb
The energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for a power law fit to a single spectrum over the duration of the burst.

Flnc_Plaw_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the power law fluence spectrum.

Flnc_Plaw_Redchisq
The reduced chi-squared statistic for the power law fit to the fluence spectrum. This may not be the statistic used to determine the best fit parameters (see flnc_plaw_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the flnc_plaw_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Flnc_Plaw_Redfitstat
The reduced fitting statistic for the power law fit to the fluence spectrum. This is the value of the statistic used to determine the best fit parameters, specified in flnc_plaw_statistic.

Flnc_Plaw_DoF
The degrees of freedom for the power law fit to the fluence spectrum.

Flnc_Plaw_Statistic
The statistical merit function for the power law fit to the fluence spectrum.

Flnc_Comp_Ampl
The amplitude of a Comptonized model fit to a single spectrum over the duration of the burst, in photon/cm2/s/keV.

Flnc_Comp_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Epeak
The peak energy of a Comptonized model fit to a single spectrum over the duration of the burst, in keV.

Flnc_Comp_Epeak_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model peak energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Epeak_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model peak energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Index
The power law index of a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Index_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model power law index for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Index_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model power law index for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Pivot
The pivot energy of a Comptonized model fit to a single spectrum over the duration of the burst, in keV. This parameter is typically fixed.

Flnc_Comp_Pivot_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Comptonized model pivot energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Pivot_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Comptonized model pivot energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Comp_Phtflux
The average photon flux, in photon/cm2/s, for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Phtflux_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s, for the Comptonized model fluence spectrum.

Flnc_Comp_Phtflnc
The photon fluence, in photon/cm2, for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the power law fluence spectrum.

Flnc_Comp_Ergflux
The average energy flux, in erg/cm2/s, for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Ergflux_Error
The 1-sigma statistical error on the average energy flux, in erg/cm2/s, for the Comptonized model fluence spectrum.

Flnc_Comp_Ergflnc
The energy fluence, in erg/cm2, for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the power law fluence spectrum.

Flnc_Comp_Phtfluxb
The average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Phtfluxb_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the Comptonized model fluence spectrum.

Flnc_Comp_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the power law fluence spectrum.

Flnc_Comp_Ergflncb
The energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for a Comptonized model fit to a single spectrum over the duration of the burst.

Flnc_Comp_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the power law fluence spectrum.

Flnc_Comp_Redchisq
The reduced chi-squared statistic for the Comptonized model fit to the fluence spectrum. This may not be the statistic used to determine the best fit parameters (see flnc_comp_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the flnc_comp_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Flnc_Comp_Redfitstat
The reduced fitting statistic for the Comptonized model fit to the fluence spectrum. This is the value of the statistic used to determine the best fit parameters, specified in flnc_comp_statistic.

Flnc_Comp_DoF
The degrees of freedom for the Comptonized model fit to the fluence spectrum.

Flnc_Comp_Statistic
The statistical merit function for the Comptonized model fit to the fluence spectrum.

Flnc_Band_Ampl
The amplitude of a Band function fit to a single spectrum over the duration of the burst, in photon/cm2/s/keV.

Flnc_Band_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Band function amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_Band_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Band function amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_Band_Epeak
The peak energy of a Band function fit to a single spectrum over the duration of the burst, in keV.

Flnc_Band_Epeak_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the Band function peak energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Band_Epeak_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the Band function peak energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_Band_Alpha
The power law index, alpha, of a Band function fit to a single spectrum over the duration of the burst.

Flnc_Band_Alpha_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the to the Band function power law, alpha, for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Band_Alpha_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the to the Band function power law, alpha, for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Band_Beta
The power law index, beta, of a Band function fit to a single spectrum over the duration of the burst.

Flnc_Band_Beta_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the to the Band function power law, beta, for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Band_Beta_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the to the Band function power law, beta, for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_Band_Phtflux
The average photon flux, in photon/cm2/s, for a Band function law fit to a single spectrum over the duration of the burst.

Flnc_Band_Phtflux_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s, for the Band function fluence spectrum.

Flnc_Band_Phtflnc
The photon fluence, in photon/cm2, for a Band function fit to a single spectrum over the duration of the burst.

Flnc_Band_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the Band function peak flux spectrum.

Flnc_Band_Ergflux
The average energy flux, in erg/cm2/s, for a Band function law fit to a single spectrum over the duration of the burst.

Flnc_Band_Ergflux_Error
The 1-sigma statistical error on the average energy flux, in erg/cm2/s, for the Band function fluence spectrum.

Flnc_Band_Ergflnc
The energy fluence, in erg/cm2, for a Band function fit to a single spectrum over the duration of the burst.

Flnc_Band_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the Band function peak flux spectrum.

Flnc_Band_Phtfluxb
The average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a Band function law fit to a single spectrum over the duration of the burst.

Flnc_Band_Phtfluxb_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the Band function fluence spectrum.

Flnc_Band_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a Band function fit to a single spectrum over the duration of the burst.

Flnc_Band_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the Band function peak flux spectrum.

Flnc_Band_Ergflncb
The energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for a Band function fit to a single spectrum over the duration of the burst.

Flnc_Band_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the Band function peak flux spectrum.

Flnc_Band_Redchisq
The reduced chi-squared statistic for the Band function fit to the fluence spectrum. This may not be the statistic used to determine the best fit parameters (see flnc_band_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the flnc_band_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Flnc_Band_Redfitstat
The reduced fitting statistic for the Band function fit to the fluence spectrum. This is the value of the statistic used to determine the best fit parameters, specified in flnc_band_statistic.

Flnc_Band_DoF
The degrees of freedom for the Band function fit to the fluence spectrum.

Flnc_Band_Statistic
The statistical merit function for the Band function fit to the fluence spectrum.

Flnc_SBPL_Ampl
The amplitude of a smoothly broken power law fit to a single spectrum over the duration of the burst, in photon/cm2/s/keV.

Flnc_SBPL_Ampl_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law fit amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Ampl_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law fit amplitude for the fluence spectrum, in photon/cm2/s/keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Pivot
The pivot energy of a smoothly broken power law fit to a single spectrum over the duration of the burst, in keV. Typically this parameter is fixed.

Flnc_SBPL_Pivot_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law pivot energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Pivot_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law pivot energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Indx1
The 1st power law of a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Indx1_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law 1st power law for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Indx1_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law 1st power law for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Brken
The break energy of a smoothly broken power law fit to a single spectrum over the duration of the burst, in keV.

Flnc_SBPL_Brken_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law break energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Brken_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law break energy for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Brksc
The break scale of a smoothly broken power law fit to a single spectrum over the duration of the burst, in keV. Typically, this parameter is fixed.

Flnc_SBPL_Brksc_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law break scale for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Brksc_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law break scale for the fluence spectrum, in keV. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Indx2
The second power law of a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Indx2_Pos_Err
The 1-sigma statistical positive error giving the upper bound to the smoothly broken power law 2nd power law for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Indx2_Neg_Err
The 1-sigma statistical negative error giving the lower bound to the smoothly broken power law 2nd power law for the fluence spectrum. An error of 0.0 implies a fixed parameter.

Flnc_SBPL_Phtflux
The average photon flux, in photon/cm2/s, for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Phtflux_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s, for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Phtflnc
The photon fluence, in photon/cm2, for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Phtflnc_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2, for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Ergflux
The average energy flux, in erg/cm2/s, for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Ergflux_Error
The 1-sigma statistical error on the average energy flux, in erg/cm2/s, for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Ergflnc
The energy fluence, in erg/cm2, for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Ergflnc_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2, for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Phtfluxb
The average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Phtfluxb_Error
The 1-sigma statistical error on the average photon flux, in photon/cm2/s between 50 and 300 keV (BATSE standard), for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Phtflncb
The photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Phtflncb_Error
The 1-sigma statistical error in the photon fluence, in photon/cm2 between 50 and 300 keV (BATSE standard), for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Ergflncb
The energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for a smoothly broken power law fit to a single spectrum over the duration of the burst.

Flnc_SBPL_Ergflncb_Error
The 1-sigma statistical error in the energy fluence, in erg/cm2 between 50 and 300 keV (BATSE standard), for the smoothly broken power law fluence spectrum.

Flnc_SBPL_Redchisq
The reduced chi-squared statistic for the smoothly broken power law fit to the fluence spectrum. This may not be the statistic used to determine the best fit parameters (see flnc_sbpl_statistic), but it is used for model comparison purposes. This value of reduced chi-squared is calculated for the best-fit parameters evaluated using the flnc_sbpl_statistic statistic. Using these best-fit parameters, a model is considered the best-fit model if it yields the lowest chi-squared value by a margin of at least 6 units for each extra parameter in the model.

Flnc_SBPL_Redfitstat
The reduced fitting statistic for the smoothly broken power law fit to the fluence spectrum. This is the value of the statistic used to determine the best fit parameters, specified in flnc_sbpl_statistic.

Flnc_SBPL_DoF
The degrees of freedom for the smoothly broken power law fit to the fluence spectrum.

Flnc_SBPL_Statistic
The statistical merit function for the smoothly broken power law fit to the fluence spectrum.

Flnc_Best_Fitting_Model
The model which best fits the data for a spectrum accumulated over the duration of the burst. The determination of the best fitting model compares the values of the likelihood-based statistic CSTAT (or other statistic defined in flnc_xxxx_statistic), among the tested models. The COMP model is preferred over the PLAW model if there is a decrease in 8.58 units of CSTAT. The BAND or SBPL models are preferred over the COMP model if there is a decrease in 11.83 units of CSTAT, then the lower of BAND and SBPL is selected as best. For a model to be selected as best, its parameters must be well-determined, as follows: the low-energy power-law index must be known to at least 0.4 (68% CL); the high-energy power-law index within 1.0; all other parameters within 40% of their value.

Flnc_Best_Model_Redchisq
The reduced chi-squared statistic for the model that provides the best fit to the fluence spectrum using the parameters optimized using flnc_xxxx_statistic. This is not the statistic used to determine the best fit parameters but is provided as a "goodness-of-fit" estimate for the model.

Bcatalog
The burst catalog version of the file: zero for preliminary (unpublished) data, integer value (1, 2, 3, etc.) for official catalog releases.

Scatalog
The spectral catalog version of the file: zero for preliminary (unpublished) data, integer value (1, 2, 3, etc.) for official catalog releases.

Last_Modified
The time (in UTC) of the last modification to the burst information.


Contact Person

Questions regarding the FERMIGBRST database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 11-Sep-2014