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J/A+A/438/1175    First INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue  (Rau+, 2005)

The 1st INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue. Rau A., Kienlin A. von, Hurley K., Lichti G.G. <Astron. Astrophys. 438, 1175 (2005)> =2005A&A...438.1175R
ADC_Keywords: Gamma rays Mission_Name: INTEGRAL Keywords: gamma rays: bursts - catalogs - instrumentation: detectors Abstract: We present the sample of gamma-ray bursts detected with the anti-coincidence shield ACS of the spectrometer SPI on-board INTEGRAL for the first 26.5 months of mission operation (up to Jan 2005). SPI-ACS works as a nearly omnidirectional gamma-ray burst detector above ∼80keV but lacks spatial and spectral information. In this catalogue, the properties derived from the 50ms light curves (e.g., T90, Cmax, Cint, variability, V/Vmax) are given for each candidate burst in the sample. A strong excess of very short events with durations <0.25s 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 V/Vmax 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. Description: Properties of 388 GRB candidates detected from Oct 27, 2002 to Jan 15, 2005 with the Anti-Coincidence Shield (ACS) of the spectrometer (SPI) onboard INTEGRAL. The table has numerous events with missing entries. For all GRBs which were confirmed by other instruments but 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 with sufficient signal-to-noise ratio. A continuously updated on-line version is available http://www.mpe.mpg.de/gamma/science/grb/1ACSburst.html including figures and ASCII files of the light curves. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 90 388 List of candidate bursts including properties of the individual events
See also: http://www.mpe.mpg.de/gamma/science/grb/1ACSburst.html : Catalog Home Page IX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999) IX/36 : GRANAT/PHEBUS catalog of cosmic gamma-ray bursts (Terekhov+, 1994-2002) J/A+AS/129/1 : GRANAT/WATCH catalogue of gamma-ray bursts (Sazonov+ 1998) J/ApJS/120/399 : ULYSSES supplement to GRB 3B catalog (Hurley+, 1999) J/ApJS/126/19 : BATSE gamma-ray burst spectral catalog. I. (Preece+, 2000) J/ApJS/134/385 : Supplement to the BATSE gamma-ray burst catalogs (Kommers+, 2001) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq ID number of the event 5- 8 I4 yr Trig.Y Trigger date (year) 9 A1 --- --- [-] 10- 11 I2 "month" Trig.M Trigger date (month) 12 A1 --- --- [-] 13- 14 I2 d Trig.D Trigger date in YYYY-MM-DD 17- 18 I2 h Trig.h Trigger time (hours) 19 A1 --- --- [-] 20- 21 I2 min Trig.m Trigger time (minutes) 22 A1 --- --- [-] 23- 24 I2 s Trig.s Trigger time (seconds) 26- 29 I4 --- Sigma Trigger significance above background 31- 36 F6.2 s T90 ? Duration of event in T90 38- 42 F5.2 s e_T90 ? Uncertainty of T90 duration 44- 50 F7.2 kct Cint ? Integrated counts 52- 55 F4.1 kct e_Cint ? rms uncertainty on Cint 57- 62 F6.2 4kct/s Cmax ? Peak count rate over 0.25s, in kct/0.25s 64- 66 F3.1 4kct/s e_Cmax ? rms uncertainty on Cmax, in kct/0.25s 68- 71 F4.2 --- V/Vmax ? V/Vmax (1) 73- 76 F4.2 --- Var(0.45) ? Variability measure, with f=0.45 (2) 78- 81 F4.2 --- e_Var(0.45) ? rms uncertainty om V/Vmax 83- 90 A8 --- Conf Confirmation by other instruments (3)
Note (1): V/Vmax compares the volume in which the event was detected to the largest possible volume in which the event would be just at the selection threshold. See Schmidt M., 1968ApJ...151..393S. Note (2): The variability was measured following the formulation of Reichart et al. (2001ApJ...552...57R). A smoothing time scale of T0.45 was used. Note (3): Designation of other instruments as follows: U = Ulysses K = Konus/Wind M = Mars-Odyssey H = HETE-2 R = RHESSI C = Helicon/Coronas-F I = INTEGRAL (SPI/IBIS) S = Swift X = RXTE/ASM
Acknowledgements: Arne Rau, arau(at)mpe.mpg.de
(End) Arne Rau [MPE, Germany], Patricia Vannier [CDS] 30-May-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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