The spectral catalogue of INTEGRAL gamma-ray bursts - Results of the joint IBIS/SPI spectral analysis
Résumé
We present the updated INTEGRAL catalogue of gamma-ray bursts (GRBs) observed between
December 2002 and February 2012. The catalogue contains the spectral parameters for 59
GRBs localized by the INTEGRAL Burst Alert System (IBAS). We used the data from the two
main instruments on board the INTEGRAL satellite: the spectrometer SPI (SPectrometer on
INTEGRAL) nominally covering the energy range 20 keV−8 MeV, and the imager IBIS (the
Imager on Board the INTEGRAL Satellite) operating in the range from 15 keV to 10 MeV. For
the spectral analysis we applied a new data extraction technique, developed to explore the
energy regions of highest sensitivity for both instruments, SPI and IBIS. It allowed us to
analyse the GRB spectra over a broad energy range and to determine the bursts’ spectral
peak energies. The spectral analysis was performed on the whole sample of GRBs triggered
by IBAS, including all the events observed in the period December 2002 to February 2012.
The catalogue contains the trigger times, burst coordinates, positional errors, durations,
and peak fluxes for 28 unpublished GRBs observed between September 2008 and February 2012.
The light curves in the 20−200 keV energy band of these events were derived using IBIS
data. We compare the prompt emission properties of the INTEGRAL GRB sample with the BATSE
and Fermi samples.
Domaines
Astrophysique [astro-ph]
Origine : Publication financée par une institution
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