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. Monnelly, J. Villasenor, N. Butler, A. Levine, A. Yoshida, Y. ShirasakiT. Sakamoto, T. Tamagawa, K. Torii, M. Matsuoka, E. E. Fenimore, M. Galassi, T. Tavenner, T. Q. Donaghy, C. Graziani, J. G. Jernigan

Research output: Contribution to journalArticlepeer-review

106 Scopus citations


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

Original languageEnglish (US)
Pages (from-to)1021-1030
Number of pages10
JournalAstronomy and Astrophysics
Issue number3
StatePublished - 2003
Externally publishedYes


  • Gamma-rays: bursts

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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