DESCRIPTION AND FORMAT OF THE GUSBAD CATALOG Version 2.1 - April 20, 2005 The GUSBAD catalog of gamma-ray bursts (GRB) is based on BATSE DISCLA data for the full Compton Gamma Ray Observatory mission from April 19, 1991 till May 26, 2000 (TJD 8365-11690). The BATSE DISCLA data provide counts in channels 1-4, covering the energy ranges 20-50, 50-100, 100-300, and > 300 keV, respectively, with a time resolution of 1024 msec. The GUSBAD software trigger requires an excess of 5 sigma over background in two of the BATSE detectors over the energy range 50-300 keV. For each GRB, the data packets of 1024 msec are assigned a p-number such that p = 301 at trigger. The properties for each gamma-ray burst given in the catalog refer to the energy range 50-300 keV. The catalog lists 2207 GRBs, for a total of 6621 lines in ASCII format. The GUSBAD catalog is described below, using the catalog entry for GUSBAD 910419.041 as an example. Also shown is the Fortran f77 format for reading each catalog entry. 1 2 3 4 5 6 7 12345678901234567890123456789012345678901234567890123456789012345678901234 910419.041 8365 3594 346-01 4 2 301 302 302 0.209 302 G 677.0 234.9 0.75 1.25 2 0.37 0.60 0.40 0.03 -2.17 104+37 13-31 1 26 3 48 designation TJD ttrig RA dec er np ptrig ptop plast V/Vm pfar cl Cmax Cmin fpk flue n5 hr1 hr2 hr3 hr4 a23 Az Al Baz Bal d1 a1 d2 a2 a10 i5 i5 i3 i3 i2 i3 i4 i4 i4 f5.3 i4 a1 f7.1 f5.1 f6.2 f6.2 i3 f4.2 f4.2 f4.2 f4.2 f5.2 i3 i3 i3 i3 i1 i3 i1 i3 designation GRB designation is GUSBAD YYMMDD.ddd where .ddd is the truncated fraction of the day TJD Truncated Julian Date TJD = JD - 2440000.5 ttrig trigger time, in seconds of day (UT) RA right ascension (J2000), in deg dec declination (J2000), in deg er the rms deviation of the np individual positions from the mean, in deg; set to 0 for np=1 np number of 1.024 s intervals used for the position derivation ptrig p-number at trigger: ptrig = 301 ptop p-number corresponding to maximum burst signal Cmax plast p-number for the last burst signal exceeding the trigger limit V/Vm V/Vmax value based on a simulation in which the GRB is removed in Euclidean space until it is below the trigger limit pfar p-number of the final burst signal at the detection limit in the V/Vm simulation cl B indicates that the classification of the event as a GRB was partly based on its appearance in the Current BATSE Burst Catalog; G indicates that the classification is made independent of other catalogs Cmax maximum count rate for the burst signal in detector d2 Cmin minimum count rate needed for trigger in detector d2 fpk peak flux in cts cm^-2 sec^-1 flue fluence of burst in cts cm^-2 n5 number of 1.024 s intervals when burst exceeds trigger limit hr1 the ratio of burst counts in ch 1/(ch 2 + ch 3) hr2 the ratio of burst counts in ch 2/(ch 2 + ch 3) hr3 the ratio of burst counts in ch 3/(ch 2 + ch 3) hr4 the ratio of burst counts in ch 4/(ch 2 + ch 3) a23 photon spectral index corresponding to count ratio ch 3/ch 2 Az azimuth of the burst, in deg Al altitude of the burst, in deg Baz azimuth of the burst in BATSE based coordinate system, in deg Bal altitude of the burst in BATSE based coordinate system, in deg d1 brightest illuminated detector a1 angle between the normal to d1 and the GRB, in deg d2 second brightest illuminated detector a2 angle between the normal to d2 and the GRB, in deg Version 1.1 - Apr 27, 2003 1.2 - Aug 28, 2004 YYMMDD entries corrected for four Leap Days. 2.1 - Apr 20, 2005 Software error in the evaluation of scattered radiation corrected, leading to rms changes in all positions (3 deg), fpk (5%), flue (2%), a23 (0.01), a1 (1 deg) and a2 (1 deg). Three GRBs were dropped, and six added for a new total of 2207 GRBs.