J/PAZh/32/508 Hard X-ray Bursts by INTEGRAL in 2003-2004 (Chelovekov+, 2006)
Hard X-ray bursts detected by the IBIS telescope onboard the INTEGRAL
Observatory in 2003-2004.
Chelovekov I.V., Grebenev S.A., Sunyaev R.A.
<Pis'ma Astron. Zh. 32, 508 (2006)>
=2006PAZh...32..508C 2006PAZh...32..508C
=2006AstL...32..456C 2006AstL...32..456C
ADC_Keywords: X-ray sources
Keywords: neutron stars - X-ray bursts - bursters
Abstract:
All of the observations performed with the IBIS telescope onboard the
INTEGRAL observatory during the first one and a half years of its
in-orbit operation (from February 10, 2003, through July 2, 2004) have
been analyzed to find X-ray bursts. The time history of the IBIS/ISGRI
total count rate in the energy range 15-25keV revealed 1077 bursts of
durations from 5 to 500s with a high statistical significance (over
the entire period of observations, only one event could be detected by
chance with a probability of 20%). A part from the events associated
with cosmic gamma-ray bursts (detected in the field of view or passed
through the IBIS shield), solar flares, and activity of the soft gamma
repeater SGR 1806-20, we were able to localize 105 bursts and, with
one exception, to identify them with previously known persistent or
transient X-ray sources (96 were identified with known X-ray
bursters). In one case, the burst source was a new burster in a low
state that received the name IGR J17364-2711. Basic parameters of the
localized bursts and their identifications are presented in the
catalog of bursts. Curiously enough, 61 bursts were detected from one
X-ray burster, GX 354-0. The statistical distributions of bursts in
duration, maximum flux, and recurrence time have been analyzed for
this source. Some of the bursts observed with the IBIS/ISGRI telescope
were also detected by the JEM-X telescope onboard the INTEGRAL
observatory in the standard X-ray energy range 3-20keV.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 97 X-ray bursts detected by the IBIS/ISGRI telescope
in the energy range 15-25 keV in 2003-2004.
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See also:
J/A+A/458/21 : INTEGRAL burst observations of 4U 1728-34 (Falanga+, 2006)
J/A+A/411/L59 : INTEGRAL reference catalog (Ebisawa+, 2003)
J/A+A/438/1175 : First INTEGRAL SPI-ACS Gamma-Ray Burst Catalogue (Rau+, 2005)
J/PAZh/30/589 : Hard X-ray catalog of Sagittarius arm (Molkov+, 2004)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Burst Number of the burst
4- 19 A16 --- Name Name of the persistent source
21- 28 A8 "DD/MM/YY" Date Observation date of the burst
30- 37 A8 "h:m:s" Time Time of the burst flux maximum (hh:mm:ss)
40- 43 F4.2 --- Flux Burst flux maximum for 15-25keV (in Crab units)
46 I1 s Ta Duration of the bin at the burst maximum, that
was used to deduce the flux value
49- 51 I3 s Tb Burst duration (time from the begining of the
burst till the flux fell to 10% of the
persistent emission level)
54- 57 F4.1 --- S/NTa Significance of the source, S/N, measured on
the image of the sky during the time bin
of the duration (in column Ta)
60- 63 F4.1 --- S/N Significance of the burst, S/N, on time
history of the IBIS/ISGRI total count rate
in the energy range 15-25keV
66- 67 I2 s DurT Duration of the time bin used to detect
the burst on time history of the IBIS/ISGRI
total count rate
70 A1 --- JEM Indicates wether the burst was also detected
by JEM-X telescope
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(End) Veta Avedisova (INASAN) 08-Jan-2007