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FERMILGRB - Fermi LAT Second Gamma-Ray Burst Catalog

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Overview

The LAT routinely observes high-energy emission from gamma-ray bursts (GRBs). Here we present the second catalog of LAT-detected GRBs, covering the first 10 years of operations, from 2008 August 4 to 2018 August 4. A total of 186 GRBs are found; of these, 91 show emission in the range 30–100 MeV (17 of which are seen only in this band) and 169 are detected above 100 MeV. Most of these sources were discovered by other instruments (Fermi/GBM, Swift/BAT, AGILE, INTEGRAL) or reported by the Interplanetary Network (IPN); the LAT has independently triggered on 4 GRBs. This catalog presents the results for all 186 GRBs.

Catalog Bibcode

2019ApJ...878...52A

References

A Decade of Gamma-Ray Bursts Observed by Fermi-LAT: The Second GRB catalog", Ajello et al. 2019, ApJ, 878, 52 (link to the paper).

Provenance

This database table was updated by the HEASARC in June 2019 using electronic data obtained from the Fermi Science Support Center (FSSC).

tl1 upper

The estimated upper limit on LAT emission end (s).

Parameters

Name
The designation of the burst. The naming scheme used is GRByymmddfff, where yymmdd is the 2-digit year, month, and day of the burst and fff the fraction of the day.

Gcn_Name
The designation of the burst in the Gamma-ray Coordinates Network (GCN) distribution list.

Time
The date/time of the trigger.

Trigger_MET
The date/time of the trigger in Fermi Mission Elapsed Time (s).

RA
The detected Right Ascension of the burst in the specified equinox.

Dec
The detected Declination of the burst in the specified equinox.

LII
The Galactic Longitude of the burst.

BII
The Galactic Latitude of the burst.

Error_Radius
The localization error from LAT transient factory analysis (deg).

Redshift
The redshift of the GRB, if available.

Luminosity_Distance
The luminosity distance calculated using the redshift of the GRB (when available), (cm).

Theta
The off-axis angle at the time of the trigger (deg).

Zenith
The zenith angle at the time of the trigger (deg).

Arr_Flag
If the GRB triggered an Autonomous Repoint Request, this flag is set to 1, otherwise is set to 0.

Distance_To_Closest
The distance to the closest 3FGL source (deg).

Irfs
The instrument response function used in the analysis.

LLE_Bbbd_Sig
The significance of the signal in the LAT Low Energy (LLE) data using the Bayesian Blocks Burst Detection algorithm (sigma).

LLE_Bbbd_Sig_Detected
Indicates whether the GRB is detected in LLE data.

LLE_T05
The LLE onset time (s). A negative value means that the burst onset occurred before the trigger time.

LLE_T90
The LLE duration time (s) defined as the interval during which the instrument measures from 5% to 95% of the total GRB counts in the 50-300 keV energy range (i.e., from lle_t05 to lle_t95).

LLE_T95
The LLE end time (s).

Tl0
The time when the first photon with probability p > 0.9 to be associated with the GRB is detected in the 100 MeV - 100 GeV energy range (s).

Tl100
The LAT emission estimated duration, defined as tl0 to tl1 (s).

Tl100_Error
The estimated error on the LAT emission duration (s).

Tl1
The time when the last photon with probability p > 0.9 to be associated with the GRB is detected in the 100 MeV - 100 GeV energy range (s).

Tl0_Lower
The estimated lower limit on the LAT emission onset time (s).

Tl1_Uppper

Like_Best_T0
The start of the time window for the likelihood analysis that returned the highest value of Test Statistics (s).

Like_Best_T1
The end of the time window for the likelihood analysis that returned the highest value of Test Statistics (s).

Like_Best_TS
The value of the Test Statistics obtained by likelihood analysis that returned the highest value of Test Statistics.

Like_Best_Flux
The flux obtained by likelihood analysis that returned the highest value of Test Statistics (ph/cm2/s).

Like_Best_Flux_Error
The estimated error on the flux obtained by likelihood analysis that returned the highest value of Test Statistics (ph/cm2/s).

Like_Best_Flux_Ene
The energy flux obtained by likelihood analysis that returned the highest value of Test Statistics (erg/cm2/s).

Like_Best_Flux_Ene_Error
The estimated error on the energy flux obtained by likelihood analysis that returned the highest value of Test Statistics (erg/cm2/s).

Like_Best_Fluence
The energy fluence obtained by likelihood analysis that returned the highest value of Test Statistics (erg/cm2).

Like_Best_Fluence_Error
The estimated error on the energy fluence obtained by likelihood analysis that returned the highest value of Test Statistics (erg/cm2).

Like_Best_GRBIndex
The photon index of the power law that models the GRB in the likelihood analysis that returned the highest value of Test Statistics.

Like_Best_GRBIndex_Error
The estimated error on the photon index of the power law that models the GRB in the likelihood analysis that returned the highest value of Test Statistics.

Like_Best_Eiso_RF
The rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis that returned the highest value of Test Statistics ( erg).

Like_Best_Eiso_RF_Error
The estimated error on the rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis that returned the highest value of Test Statistics.

Like_LAT_T0
The start of the time window for the likelihood analysis in the LAT time window (s).

Like_LAT_T1
The end of the time window for the likelihood analysis in the LAT time window (s).

Like_LAT_TS
The value of the Test Statistics obtained by likelihood analysis in the LAT time window.

Like_LAT_Flux
The flux obtained by likelihood analysis in the LAT time window (ph/cm2/s).

Like_LAT_Flux_Error
The estimated error on the flux obtained by likelihood analysis in the LAT time window (ph/cm2/s).

Like_LAT_Flux_Ene
The energy flux obtained by likelihood analysis in the LAT time window (erg/cm2/s).

Like_LAT_Flux_Ene_Error
The estimated error on the energy flux obtained by likelihood analysis in the LAT time window (erg/cm2/s).

Like_LAT_Fluence
The energy fluence obtained by likelihood analysis in the LAT time window (erg/cm2).

Like_LAT_Fluence_Error
The estimated error on the energy fluence obtained by likelihood analysis in the LAT time window (erg/cm2).

Like_LAT_GRBIndex
The photon index of the power law that models the GRB in the likelihood analysis in the LAT time window.

Like_LAT_GRBIndex_Error
The estimated error on the photon index of the power law that models the GRB in the likelihood analysis in the LAT time window.

Like_LAT_Eiso_RF
The rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis in the LAT time window (erg).

Like_LAT_Eiso_RF_Error
The estimated error on the rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis in the LAT time window (erg).

Like_GBM_T0
The start of the time window for the likelihood analysis in the GBM time window (s).

Like_GBM_T1
The end of the time window for the likelihood analysis in the GBM time window (s).

Like_GBM_TS
The value of the Test Statistics obtained by likelihood analysis in the GBM time window.

Like_GBM_Flux
The flux obtained by likelihood analysis in the GBM time window (ph/cm2/s).

Like_GBM_Flux_Error
The estimated error on the flux obtained by likelihood analysis in the GBM time window (ph/cm2/s).

Like_GBM_Flux_Ene
The energy flux obtained by likelihood analysis in the GBM time window (erg/cm2/s).

Like_GBM_Flux_Ene_Error
The estimated error on the energy flux obtained by likelihood analysis in the GBM time window (erg/cm2/s).

Like_GBM_Fluence
The energy fluence obtained by likelihood analysis in the GBM time window (erg/cm2).

Like_GBM_Fluence_Error
The estimated error on the energy fluence obtained by likelihood analysis in the GBM time window (erg/cm2).

Like_GBM_GRBIndex
The photon index of the power law that models the GRB in the likelihood analysis in the GBM time window.

Like_GBM_GRBIndex_Error
The estimated error on the photon index of the power law that models the GRB in the likelihood analysis in the GBM time window.

Like_GBM_Eiso_RF
The rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis in the GBM time window (erg).

Like_GBM_Eiso_RF_Error
The estimated error on the rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis in the GBM time window (erg).

Like_Ext_T0
The start of the time window for the likelihood analysis in the EXT time window (s).

Like_Ext_T1
The end of the time window for the likelihood analysis in the EXT time window (s).

Like_Ext_TS
The value of the Test Statistics obtained by likelihood analysis in the EXT time window.

Like_Ext_Flux
The flux obtained by likelihood analysis in the EXT time window (ph/cm2/s).

Like_Ext_Flux_Error
The estimated error on the flux obtained by likelihood analysis in the EXT time window (ph/cm2/s).

Like_Ext_Flux_Ene
The energy flux obtained by likelihood analysis in the EXT time window (erg/cm2/s).

Like_Ext_Flux_Ene_Error
The estimated error on the energy flux obtained by likelihood analysis in the EXT time window (erg/cm2/s).

Like_Ext_Fluence
The energy fluence obtained by likelihood analysis in the EXT time window (erg/cm2).

Like_Ext_Fluence_Error
The estimated error on the energy fluence obtained by likelihood analysis in the EXT time window (erg/cm2).

Like_Ext_GRBIndex
The photon index of the power law that models the GRB in the likelihood analysis in the EXT time window.

Like_Ext_GRBIndex_Error
The estimated error on the photon index of the power law that models the GRB in the likelihood analysis in the EXT time window.

Like_Ext_Eiso_RF
The rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis in the EXT time window (erg).

Like_Ext_Eiso_RF_Error
The estimated error on the rest frame isotropic energy from 100 MeV - 10 GeV in the likelihood analysis in the EXT time window (erg).

Ext_Emission_Max_Ene
The maximum energy of the event with >90% probability to be associated with the GRB, calculated during the time resolved analysis (MeV).

Ext_Emission_Max_Ene_P
The probability of the event with maximum energy calculated during the time resolved analysis.

Ext_Emission_Max_Ene_T
The arrival time of the event with maximum energy calculated during the time resolved analysis (s).

Ext_Emission_N
The number of events with probability >90% to be associated with the GRB, calculated during the time resolved analysis.

LAT_Bpl_Chi2
The value of the chi2 obtained by fitting the LAT light curve with a broken power law model.

LAT_Bpl_F0
The normalization of the broken power law model.

LAT_Bpl_F0_Error
The error on the normalization of the broken power law model.

LAT_Bpl_Index1
The first index of the broken power law model.

LAT_Bpl_Index1_Error
The error on the first index of the broken power law model.

LAT_Bpl_Index2
The second index of the broken power law model.

LAT_Bpl_Index2_Error
The error on the second index of the broken power law model.

LAT_Bpl_Timebreak
The time of the break (s).

LAT_Bpl_Timebreak_Error
The error on the time of the break (s).

LAT_Spl_Chi2
The value of the chi2 obtained by fitting the LAT light curve with a simple power law model.

LAT_Spl_Index1
The index of the simple power law model.

LAT_Spl_Index1_Error
The error on the index of the simple power law model.

LAT_F0
The normalization of the simple power law model.

LAT_F0_Error
The error on the normalization of the simple power law model.

Late_Index
The index that best describe the behavior at late time (either LAT_BPL_IN2 or LAT_SPL_IN1, depending on the value of the respective chi2.

Late_Index_Error
The error on the index that best describe the behavior at late time.

Su_Tsinput
The test statistic resulting from the LAT transient factory detection algorithm.

GBM_Cat_Name
The designation of the GRB in the Fermi GBM GRB catalog.

GBM_Cat_T05
The GBM T05, when available. Otherwise this number is set to 0 (s).

GBM_Cat_T90
The GBM T90, when available. Otherwise this number correspond to the estimated duration of the prompt emission (s).

GBM_Cat_T90_Error
The error on the GBM T90 from the Fermi GBM GRB catalog (s).

GBM_Cat_T95
The calculated as GBMT90+GBMT05 (s).

GBM_Cat_Fluence
The fluence in the 10 keV-1 MeV energy band, from the Fermi GBM GRB catalog (erg/cm2/s).

GBM_Cat_Fluence_Error
The error on the fluence in the 10 keV-1 MeV energy band, from the Fermi GBM GRB catalog (erg/cm2/s).


Contact Person

Questions regarding the FERMILGRB database table can be addressed to the HEASARC User Hotline.
Page Author: Browse Software Development Team
Last Modified: Saturday, 29-Jun-2019 23:40:44 EDT