Uehara 2010 GRB 071112C and GRB 080506的X射线耀的观测

主要内容:
包括同时期的光学观测。没限制住什么模型，说这也行那也可以。

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Title:		Infrared/optical - X-ray simultaneous observations of X-ray flares in GRB 071112C and GRB 080506
Authors:		Uehara, T.; Uemura, M.; Kawabata, K. S.; Fukazawa, Y.; Yamazaki, R.; Arai, A.; Sasada, M.; Ohsugi, T.; Mizuno, T.; Takahashi, H.; Katagiri, H.; Yamashita, T.; Ohno, M.; Sato, G.; Sato, S.; Kino, M.
Publication:		eprint arXiv:1006.0785
Publication Date:		06/2010
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		10 pages, 5 figures, accepted to Astronomy and Astrophysics
Bibliographic Code:		2010arXiv1006.0785U

Abstract

We investigate the origin of short X-ray flares which are occasionally observed in early stages of afterglows of gamma-ray bursts (GRBs). We observed two events, GRB 071112C and GRB 080506, before the start of X-ray flares in the optical and near-infrared (NIR) bands with the 1.5-m Kanata telescope. In conjunction with published X-ray and optical data, we analyzed densely sampled light curves of the early afterglows and spectral energy distributions (SEDs) in the NIR-X-ray ranges. We found that the SEDs had a break between the optical and X-ray bands in the normal decay phases of both GRBs regardless of the model for the correction of the interstellar extinction in host galaxies of GRBs. In the X-ray flares, X-ray flux increased by 3 and 15 times in the case of GRB 071112C and 080506, respectively, and the X-ray spectra became harder than those in the normal decay phases. No significant variation in the optical-NIR range was detected together with the X-ray flares. These results suggest that the X-ray flares were associated with either late internal shocks or external shocks from two-component jets.

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