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

• Main Authors: 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, Pizzichini, G, Vanderspek, R, Crew, G, Doty, J, Monelly, G, Villasenor, J, Butler, N, Levine, A, Yoshida, A, Shirasaki, Y, Sakamoto, T, Tamagawa, T, Torii, K, Matsuoka, M, Fenimore, E. E, Galassi, M, Tavenner, T, Donaghy, T. Q, Graziani, C, Jernigan, J. G
• Format: Journal Article
• Language: English
• Published: 21.06.2002
• Subjects: Physics - Astrophysics of Galaxies; Physics - Cosmology and Nongalactic Astrophysics; Physics - Earth and Planetary Astrophysics; Physics - High Energy Astrophysical Phenomena; Physics - Instrumentation and Methods for Astrophysics; Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.astro-ph/0206380

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.