INTSPIAGRB ivo://nasa.heasarc/intspiagrb NASA/GSFC HEASARC Rau, Kienlin, Hurley, Lichti 2026-04-10 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov GRB The First INTEGRAL SPI-ACS Gamma-Ray Burst (GRB) Catalog contains the sample of gamma-ray bursts detected with the Anti-Coincidence Shield (ACS) of the SPI spectrometer on-board the INTEGRAL spacecraft for the first 26.5 months of mission operations (up to January 2005). The SPI-ACS works as a nearly omnidirectional gamma-ray burst detector above ~80 keV, but it lacks spatial and spectral information. In this catalog, the properties derived from the 50 millisecond (ms) light curves (e.g., T_90, C_max, C_int, variability, and V/V_max) are given for each candidate burst in the sample. A strong excess of very short events with durations < 0.25 seconds is found. This population is shown to be significantly different from the short- and long-duration burst sample by means of the intensity distribution and the V/V_max test and is certainly connected with cosmic ray hits in the detector. A rate of 0.3 true gamma-ray bursts per day is observed. This table lists the properties of 388 GRB candidates detected from Oct 27, 2002 to Jan 15, 2005 with the Anti-Coincidence Shield (ACS) of SPI. It has numerous events with missing entries, notice. For all GRBs which were confirmed by other instruments but were detected by SPI-ACS below the sample selection threshold, only the time, date, significance and common instruments are listed. Furthermore, the variability measure was obtained only for long-duration events which had sufficiently large signal-to-noise ratios. This table was created by the HEASARC in October 2005 based on CDS table J/A+A/438/1175/table2.dat . This is a service provided by NASA HEASARC . 2005A&A...438.1175R https://heasarc.gsfc.nasa.gov/W3Browse/all/intspiagrb.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=intspiagrb GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_intspiagrb&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GAMMA-RAY BURSTS 0.0166666666666667 Gamma-ray public intspiagrb INTEGRAL First SPI-ACS Gamma-Ray Burst Catalog var045_measure_error RMS Uncertainty of the Variability Measure with f=0.45 stat.error;src.var.index double nullable counts_error RMS Uncertainty of Integrated Counts (kct) kct stat.error;phot.count;em.gamma double nullable significance Trigger Significance above Background stat.likelihood;obs short nullable sequence_number Unique Identifying Number of the Event meta.id;meta.main short nullable duration Duration of Event in T90 (s) s time.duration;obs float nullable max_count_rate_error RMS Uncertainty of Max Count Rate (kct/0.25s) 4_kct/s stat.error;phot.count;em.gamma.hard;stat.max double nullable max_count_rate Peak Count Rate over 0.25 seconds (kct/0.25s) 4_kct/s phot.count;em.gamma.hard;stat.max double nullable v_upon_vmax V/Vmax double nullable duration_error Uncertainty of T90 Duration (s) s stat.error;time.interval float nullable name Event Designation Based on Date meta.id char nullable "time" Trigger Date mjd time.epoch double nullable confirmation Flags Indicate Confirmation by Other Instruments meta.code char nullable counts Integrated Counts (kct) kct phot.count;em.gamma double nullable var045_measure Variability Measure, with f=0.45 src.var.index double nullable "__row" System index column char nullable