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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
    =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:

       FileName      Lrecl  Records   Explanations

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.


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

   Bytes Format Units   Label   Explanations

   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

(End)                  Veta Avedisova (INASAN)                       08-Jan-2007