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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 88 388 List of candidate bursts including properties
of the individual events
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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
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Bytes Format Units Label Explanations
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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)
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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 1968ApJ...151..393S.
Note (2): The variability was measured following the formulation of
Reichart et al. (2001ApJ...552...57R 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
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Acknowledgements: Arne Rau, arau(at)mpe.mpg.de
(End) Arne Rau [MPE, Germany], Patricia Vannier [CDS] 30-May-2005