Gao 2009 用晚期的内激波解释 GRB 080129 的光学耀发

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Title:		Optical/infrared flares of GRB 080129 from late internal shocks
Authors:		Gao, Wei-Hong
Publication:		eprint arXiv:0903.2768
Publication Date:		03/2009
Origin:		ARXIV
Keywords:		Astrophysics - Solar and Stellar Astrophysics
Comment:		12 pages, 3 figures, 1 table, accepted for publication in ApJ
Bibliographic Code:		2009arXiv0903.2768G

Abstract

Strong optical and near-infrared (NIR) flares were discovered in the afterglow of GRB 080129. Their temporal behaviors, the sudden emergence and the quick disappearance, are rather similar to that of many X-ray flares (for instance, the giant flare of GRB 050502B). We argue that the optical/NIR flares following GRB 080129 are a low energy analogy of the X-ray flares and the most likely interpretation is the "late internal shock model". In this model, both the very sharp decline and the very small ratio between the duration and the occurrence time of the optical/NIR flares in GRB 080129 can be naturally interpreted. The initial Lorentz factor of the flare outflow is found to be $\sim 30$, consistent with the constraint $\leq 120$ set by the forward shock afterglow modeling. Other possibilities, like the reverse shock emission or the radiation from the continued but weaker and weaker collision between the initial GRB outflow material, are disfavored.

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