KOMMERSGRB - Kommers et al. (2001) BATSE Non-Triggered Gamma-Ray Burst Catalog

Overview

This is the Kommers et al. (2001) Non-Triggered Burst Supplement to the BATSE Gamma-Ray Burst (GRB) Catalog. It contains 873 "non-triggered" GRBs that were detected in a search of the BATSE Archival continuous data recorded between 1991 December 9 and 1997 December 17 for which the BATSE on-board burst trigger was not activated, for example because the burst was too faint to exceed the on-board detection threshold or it occurred while the on-board trigger was disabled for technical reasons. For each burst, the catalog gives an estimated source direction, duration, peak flux, and fluence. This catalog increases the number of GRBs detected using BATSE by 48% during the time period covered by the search.

Catalog Bibcode

2001ApJS..134..385K

References

Kommers, J.K., Lewin, W.H.G., Kouveliotou, C., van Paradijs, J., Pendleton, G.N., Meegan, C.A. and Fishman, G.J. 2001, ApJS, 134, 385

Provenance

This database table was created at the HEASARC in September 2001 using the authors' file http://space.mit.edu/BATSE/ntgrb-ascii.html

Parameters

Name
The designation of the gamma-ray burst based on the date on which the GRB occurred (in Year-Month-Day format to the nearest hundredth of a day: e.g., the burst on 1991 December 14 at 18:42 UT is labelled as "NTB 911214.77") plus the prefix "NTB" (for Non-Triggered Burst)/

Day_NTB
The Truncated Julian Date (TJD) on which the GRB occurred: TJD is related to Julian Date (JD) by TJD = JD - 2440000.5.

Seconds_NTB
The time of the event, in seconds of day UT, within the day specified by the parameter day_ntb. In the original table this was given to a precision of 0.1 seconds

Time
The start time (~UT) of the GRB in the HEASARC standard time format. This parameter was created by the HEASARC based on the day_ntb and seconds_ntb parameters. The seconds_ntb parameter in the original table was given to a precision of 0.1 seconds

Detector_1
The BATSE detector that was most brightly iIlluminated by the event.

Detector_2
The BATSE detector that was second-most brightly illuminated by the event.

X_Pos
The X Position of CGRO (km) relative to the geocenter.

Y_Pos
The Y Position of CGRO (km) relative to the geocenter.

Z_Pos
The Z Position of CGRO (km) relative to the geocenter.

Zaxis_RA
The Right Ascension of the CGRO +Z Axis (degrees).

Zaxis_Dec
The Declination of the CGRO +Z Axis (degrees).

Xaxis_RA
The Right Ascension of the CGRO +X Axis (degrees).

Xaxis_Dec
The Declination of the CGRO +X Axis (degrees).

Azimuth_Geocen
The CGRO Azimuth of the Earth Center (degrees).

Elevation_Geocen
The CGRO Elevation of the Earth Center (degrees).

RA
The Right Ascension of the best-fit source direction for the event. This was given in J2000 decimal degrees to a precision of 0.1 degrees in the original table.

Dec
The Declination of the best-fit source direction for the event. This was given in J2000 decimal degrees to a precision of 0.1 degrees in the original table.

LII
The Galactic Longitude of the best-fit source direction for the event.

BII
The Galactic Latitude of the best-fit source direction for the event.

Error_Radius
The uncertainty in the best-fit source direction in degrees. This was given to a precision of 0.1 degrees in the original table.

Sun_Angle
The angle in degrees between the Sun and the best-fit source direction.

Geocen_Angle
The angle in degrees between the earth center and the best-fit source direction.

Max_Cts_1024
The maximum counts for the event in discriminator (DISCLA) channels 2 and 3 (50-100 keV and 100-300 keV, respectively) on the 1.024-s timescale, where values of 0.0 indicate that the event was not detected in DISCLA channels 2 and 3 on this time scale.

Min_Cts_1024
The minimum counts required for the detection of the event on the 1.024-s timescale, where values of -1.0 indicate that the event was not detected on this timescale.

Max_Cts_4096
The maximum counts for the event in discriminator (DISCLA) channels 2 and 3 (50-100 keV and 100-300 keV, respectively) on the 4.096-s timescale, where values of 0.0 indicate that the event was not detected in DISCLA channels 2 and 3 on this time scale.

Min_Cts_4096
The minimum counts required for the detection of the event on the 4.096-s timescale, where values of -1.0 indicate that the event was not detected on this timescale.

Max_Cts_8192
The maximum counts for the event in discriminator (DISCLA) channels 2 and 3 (50-100 keV and 100-300 keV, respectively) on the 8.192-s timescale, where values of 0.0 indicate that the event was not detected in DISCLA channels 2 and 3 on this time scale.

Min_Cts_8192
The minimum counts required for the detection of the event on the 8.192-s timescale, where values of -1.0 indicate that the event was not detected on this timescale.

T50
The 50% duration of the burst in seconds. T50 measures the duration of the time interval during which 50% of the total observed counts have been detected. The start of the T50 interval is defined by the time at which 25% of the total counts have been detected, and the end of the T50 interval is defined by the time at which 75% of the total counts have been detected.

T50_Error
The uncertainty in the T50 interval, in seconds.

T50_Start
The start time of the T50 interval in seconds of the day specified by the day_ntb parameter value: thus, a value of 43200.0 is equivalent to a time of 12:00 UT.

T90
The 90% duration of the burst in seconds. T90 measures the duration of the time interval during which 90% of the total observed counts have been detected. The start of the T90 interval is defined by the time at which 5% of the total counts have been detected, and the end of the T90 interval is defined by the time at which 95% of the total counts have been detected.

T90_Error
The uncertainty in the T90 interval,in seconds.

T90_Start
The start time of the T90 interval in seconds of the day specified by the day_ntb parameter value: thus, a value of 43200.0 is equivalent to a time of 12:00 UT.

Flux_1024
The peak flux for the event in discriminator (DISCLA) channels 2 and 3 (50-100 keV and 100-300 keV, respectively), in photons/cm²/s, on the 1.024-s timescale.

Flux_1024_Error
The uncertainty in the peak flux, in photons/cm²/s, on the 1.024-s timescale.

Fluence
The fluence for the event in discriminator (DISCLA) channels 2 and 3 (50-100 keV and 100-300 keV, respectively), in erg/cm².

Fluence_Error
The uncertainty in the fluence for the event, in erg/cm².

Contact Person

Questions regarding the KOMMERSGRB database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:29:44 EDT