Jin 2009 GRB 081109A的wind+ISM 拟合

主要内容:
认为它的外部介质是先wind, 然后在1e17cm左右变为均匀介质(还不是星际介质).

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Title:		The X-ray afterglow of GRB 081109A: clue to the wind bubble structure
Authors:		Jin, Zhi-Ping; Xu, Dong; Fan, Yi-Zhong; Wei, Da-Ming
Publication:		eprint arXiv:0903.4476
Publication Date:		03/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		6 pages, 4 figures, MNRAS submitted
Bibliographic Code:		2009arXiv0903.4476J

Abstract

We present the prompt BAT and afterglow XRT data of Swift-discovered GRB081109A up to ~5\times10^5 sec after the trigger. The ground-based optical afterglow follow-ups are rare for this event. The temporal and spectral indices of the X-ray afterglow emission change remarkably, which are interpreted as the GRB outflow firstly expands into the stellar-wind-like (WIND) medium surrounding the progenitor (for t\lesssim 300 sec after the burst), and lately expands into the homogeneous interstellar-medium like (ISM) medium. Numerical fit of the afterglow data indicates that for this burst the parameter of the WIND medium, $A_*$, is ~0.01, the particle density, $n$, of the ISM-like medium is ~0.1 cm^-3, and the WIND-ISM transition radius, $R_t$, occurs at ~3.3\times10^17 cm.

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