Journal
ASTRONOMY & ASTROPHYSICS
Volume 400, Issue 3, Pages 1021-1030Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20030074
Keywords
gamma-rays : bursts
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We present a spectral analysis of 35 GRBs detected with the HETE-2 gamma-ray detectors (the FREGATE instrument) in the energy range 7-400 keV. The GRB sample analyzed is made of GRBs localized with the Wide Field X-ray Monitor onboard HETE-2 or with the GRB Interplanetary Network. We derive the spectral parameters of the time-integrated spectra, and present the distribution of the low-energy photon index, alpha, and of the peak energy, E-p. We then discuss the existence and nature of the recently discovered X-Ray Flashes and their relationship with classical GRBs.
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