The afterglow of GRB 021211: Another case of reverse shock emission

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	The afterglow of GRB 021211: Another case of reverse shock emission
	Wei, DM
刊名	ASTRONOMY & ASTROPHYSICS
	2003-04-01
卷号	402 期号:1 页码:L9-L12
关键词	gamma rays : bursts
ISSN号	0004-6361
英文摘要	GRB 021211 was first detected by HETE II and its early afterglow has been observed. There is a break in its afterglow light curve at about 12 min after the bursts, before the break the optical flux decays with a power-law index of about -1.6, while at late time the power-law slope is about -1 (Chornock et al. 2002). Here we will show that the afterglow light curve of GRB 021211 can be explained within the framework of the standard fireball model. We show that the afterglow emission before the break time is the contribution of the emission from both the reverse shock and the forward shock, while the afterglow emission after the break time is mainly due to the forward shock emission. From the fitting we can give constraints on the parameters: the initial Lorentz factor 250less than or equal togamma(0)less than or equal to900, and the surrounding medium density ngreater than or equal to1.6x10(-3) atoms cm(-3). We propose that since the values of epsilon(B) and epsilon(e) are somewhat smaller for GRB 021211, so the peak energy of the reverse shock emission is well below the optical band, and thus it is substantially fainter than 990123 at similar epochs. Also we suggest that such a break might be a common feature in early optical afterglows.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY BURSTS ; OPTICAL FLASH
收录类别	SCI
语种	英语
WOS记录号	WOS:000182128200003
公开日期	2012-08-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4632]
专题	紫金山天文台_宇宙伽马暴、中子星及相关物理研究团组
作者单位	1.Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100864, Peoples R China
推荐引用方式 GB/T 7714	Wei, DM. The afterglow of GRB 021211: Another case of reverse shock emission[J]. ASTRONOMY & ASTROPHYSICS,2003,402(1):L9-L12.
APA	Wei, DM.(2003).The afterglow of GRB 021211: Another case of reverse shock emission.ASTRONOMY & ASTROPHYSICS,402(1),L9-L12.
MLA	Wei, DM."The afterglow of GRB 021211: Another case of reverse shock emission".ASTRONOMY & ASTROPHYSICS 402.1(2003):L9-L12.