Klotz 2009 TAROT 对2001－2009的伽玛暴早期光学余辉的观测

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Title:
Early optical observations of GRBs by the TAROT telescopes: period 2001-2008
Authors:
Klotz, A.; Boer, M.; Atteia, J. L.; Gendre, B.
Publication:
eprint arXiv:0902.0898
Publication Date:
02/2009
Origin:
ARXIV
Keywords:
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extra-Galactic Astrophysics
Comment:
13 pages, 2 color figures, 5 b&w figures. Accepted for publication in Astronomical Journal
Bibliographic Code:
2009arXiv0902.0898K
AbstractThe TAROT telescopes (Telescopes a Action Rapide pour les Objets Transitoires) are two robotic observatories designed to observe the prompt optical emission counterpart and the early afterglow of gamma ray bursts (GRBs). We present data acquired between 2001 and 2008 and discuss the properties of the optical emission of GRBs, noting various interesting results. The optical emission observed during the prompt GRB phase is rarely very bright: we estimate that 5% to 20% of GRBs exhibit a bright optical flash (R<14) during the prompt gamma-ray emission, and that more than 50% of the GRBs have an optical emission fainter than R=15.5 when the gamma-ray emission is active. We study the apparent optical brightness distribution of GRBs at 1000 s showing that our observations confirm the distribution derived by other groups. The combination of these results with those obtained by other rapid slewing telescopes allows us to better characterize the early optical emission of GRBs and to emphasize the importance of very early multi-wavelength GRB studies for the understanding of the physics of the ejecta.
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