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