Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE
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, Ep . We then discuss the existence and nature of the recently discovered X-Ray Flashes and their relationship with classical GRBs.
Appendix A is only available in electronic form at http://edpsciences.org- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 2003
- DOI:
- 10.1051/0004-6361:20030074
- arXiv:
- arXiv:astro-ph/0206380
- Bibcode:
- 2003A&A...400.1021B
- Keywords:
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- gamma-rays: bursts;
- Astrophysics
- E-Print:
- 14 pages, 43 figures, accepted for publication in Astronomy and Astrophysics