Journal
ASTRONOMY & ASTROPHYSICS
Volume 452, Issue 1, Pages 113-117Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20064811
Keywords
gamma rays : burst
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Using the IBIS Compton mode, the INTEGRAL satellite is able to detect and localize bright and hard GRBs, which happen outside of the nominal INTEGRAL field of view. We have developed a method of analyzing such INTEGRAL data to obtain the burst location and spectra. We present the results for the case of GRB030406. The burst is localized with the Compton events, and the location is consistent with the previous Interplanetary Network position. A spectral analysis is possible by detailed modeling of the detector response for such a far off-axis source with an offset of 36.9 degrees. The average spectrum of the burst is extremely hard: the photon index above 400 keV is -1.7, with no evidence of a break up to 1.1MeV at a 90% confidence level.
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