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

作     者：Xiao-Hong Cui Zhuo Li Li-Ping Xin 

作者机构：National Astronomical ObservatoriesChinese Academy of Sciences Department of AstronomyPeking University Kavli Institute for Astronomy and AstrophysicsPeking University 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2013年第13卷第1期

页      面：57-70页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：Supported by the National Natural Science Foundation of China supported by the National Basic Research Programof China (973 Program,2009CB824800) the China Postdoctoral Science Foundation funded project(No. 20110490590) the National Natural Science Foundation of China (Grant No. 111030262) the Foundation for the Authors of National Excellent Doctoral Dissertations of China 

主　　题：radiation mechanisms: non thermal    gamma rays: bursts    dust: ex tinction 

摘      要：Observations imply that long ＂y-ray bursts （GRBs） originate from the explo- sions of massive stars, therefore they may occur in the molecular clouds where their progenitors were born. We show that the prompt optical-UV emission from GRBs may be delayed due to dust extinction, which can explain the observed optical delayed on- set and fast rise in GRB 080319B well. The density and the size of the molecular cloud around GRB 080319B are roughly constrained to be ~ 103 cm-z 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 obser- vations 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.