Spectral analysis of 24 grbs/xrfs observed with hete-2/fregate

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

doi:10.1051/0004-6361:20030074

Spectral analysis of 24 grbs/xrfs observed with hete-2/fregate

Jun, 2002

7 pages

Published in:

Astron.Astrophys. 400 (2003) 1021

e-Print:

astro-ph/0206380 [astro-ph]

DOI:

10.1051/0004-6361:20030074

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Abstract: (arXiv)

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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