Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds ?

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	Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds ?
	Cui Xiaohong 1; Li Zhuo 2; Xin Liping 1
刊名	Research in Astronomy and Astrophysics
	2013
卷号	13 期号:1 页码:57
ISSN号	1674-4527
英文摘要	Observations imply that long γ-ray bursts (GRBs) originate from the explosions of massive stars, therefore they may occur in the molecular clouds where their progenitorswere born.We show that the prompt optical-UV emission fromGRBs may be delayed due to dust extinction, which can explain the observed optical delayed onset and fast rise in GRB 080319B well. The density and the size of the molecular cloud around GRB 080319B are roughly constrained to be ～ 10~3 cm~(?3) and ～ 8 pc, respectively. We also investigate other GRBs with prompt optical-UV data, and find similar values of the densities and sizes of the local molecular clouds. Future observations of prompt optical-UV emission from GRBs on a timescale of subseconds, e.g. by UFFO-Pathfinder and SVOM-GWAC, will provide more evidence and probes of the local environments of GRBs.
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37616]
专题	中国科学院国家天文台
作者单位	1.中国科学院国家天文台 2.北京大学
推荐引用方式 GB/T 7714	Cui Xiaohong,Li Zhuo,Xin Liping. Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds ?[J]. Research in Astronomy and Astrophysics,2013,13(1):57.
APA	Cui Xiaohong,Li Zhuo,&Xin Liping.(2013).Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds ?.Research in Astronomy and Astrophysics,13(1),57.
MLA	Cui Xiaohong,et al."Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds ?".Research in Astronomy and Astrophysics 13.1(2013):57.