Spectral analysis of 35 GRBs/XRFs observed with HETE-2/FREGATE
C. BarraudLaboratoire d'Astrophysique, Observatoire Midi-Pyrénées, 31400 Toulouse, FranceJ. F. OliveC.E.S.R., Observatoire Midi-Pyrénées, 31028 Toulouse Cedex, FranceJohn Patrick LestradeLaboratoire d'Astrophysique, Observatoire Midi-Pyrénées, 31400 Toulouse, FranceJ. L. AtteiaLaboratoire d'Astrophysique, Observatoire Midi-Pyrénées, 31400 Toulouse, FranceKevin HurleyUC Berkeley Space Sciences Laboratory, Berkeley CA 94720-7450, USAG. RickerD. Q. LambDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USAN. KawaiDepartment of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, JapanM. BoërC.E.S.R., Observatoire Midi-Pyrénées, 31028 Toulouse Cedex, FranceJ. P. DezalayC.E.S.R., Observatoire Midi-Pyrénées, 31028 Toulouse Cedex, FranceG. PizzichiniR. VanderspekG. CrewJ. DotyG. MonnellyJ. VillaseñorN. ButlerAlan M. LevineA. YoshidaDepartment of Physics, Aoyama Gakuin University, Chitosedai 6-16-1 Setagaya-ku, Tokyo 157-8572, JapanY. ShirasakiNational Astronomical Observatory, Osawa 2-21-1, Mitaka, Tokyo 181-8588 JapanT. SakamotoDepartment of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, JapanT. TamagawaRIKEN (Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, JapanK. ToriiRIKEN (Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, JapanM. MatsuokaE. E. FenimoreLos Alamos National Laboratory, PO Box 1663, Los Alamos, NM, 87545, USAM. GalassiLos Alamos National Laboratory, PO Box 1663, Los Alamos, NM, 87545, USAT. TavennerLos Alamos National Laboratory, PO Box 1663, Los Alamos, NM, 87545, USAT. DonaghyDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USAC. GrazianiDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USAJ. G. JerniganUC Berkeley Space Sciences Laboratory, Berkeley CA 94720-7450, USA
2003en
ABI
Аннотация
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, . We then discuss the existence and nature of the recently discovered X-Ray Flashes and their relationship with classical GRBs.
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