Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE

C. Barraud , J-F. Olive , J.P. Lestrade , J-L. Atteia , K. Hurley , G. Ricker , D. Q. Lamb , N. Kawai

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M. Boer J-P. Dezalay G. Pizzichini R. Vanderspek G. Crew J. Doty G. Monelly J. Villasenor N. Butler A. Levine A. Yoshida Y. Shirasaki T. Sakamoto T. Tamagawa K. Torii M. Matsuoka E. E. Fenimore M. Galassi T. Tavenner T. Q. Donaghy C. Graziani J.G. Jernigan

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classification 🌌 astro-ph

keywords grbshete-2spectralanalysisenergyfregatepeakx-ray

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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_peak . We then discuss the existence and nature of the recently discovered X-Ray Flashes and their relationship with classical GRBs.

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Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE

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