中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
VERY BRIGHT PROMPT AND REVERSE SHOCK EMISSION OF GRB 140512A

文献类型:期刊论文

作者Huang, Xiao-Li1,2; Xin, Li-Ping3; Yi, Shuang-Xi4; Zhong, Shu-Qing1,2; Qiu, Yu-Lei3; Deng, Jin-Song3; Wei, Jian-Yan3; Liang, En-Wei1,2,3
刊名ASTROPHYSICAL JOURNAL
出版日期2016-12-10
卷号833期号:1
关键词gamma-ray burst: general gamma-ray burst: individual (GRB 140512A) methods: observational radiation mechanisms: non-thermal
英文摘要We report our observations of very bright prompt optical and reverse shock (RS) optical emission of GRB 140512A and analyze its multi-wavelength data observed with the Swift and Fermi missions. It is found that the joint optical-X-ray-gamma-ray spectrum with our first optical detection (R = 13.09 mag) at T-0 + 136 s during the second episode of the prompt gamma-rays can be fit by a single power law with an. index of -1.32 +/- 0.01. Our empirical fit to the afterglow light. curves indicates that the observed bright optical afterglow with R = 13.00 mag at the peak time is consistent with predictions of the RS and forward shock (FS) emission of external shock models. A joint optical-X-ray afterglow spectrum is well fit with an absorbed single power law, with an index evolving with time from -1.86 +/- 0.01 at the peak time to -1.57 +/- 0.01 at a late epoch, which could be due to the evolution of the ratio of the RS to FS emission fluxes. We fit the light. curves with standard external models, and derive the physical properties of the outflow. It is found that the ratio RB equivalent to epsilon(B,r)/epsilon(B,f) is 8187, indicating a high magnetization degree in the RS region. Measuring the relative radiation efficiency with R-e equivalent to epsilon(e,r)/epsilon(e,f), we have Re = 0.02, implying that the radiation efficiency of the RS is much lower than that in FS. We also show that the RB of GRBs 990123, 090102, and 130427A are similar to that of GRB 140512A and their apparent difference may be mainly attributed to the difference of the jet kinetic energy, initial Lorentz factor, and medium density among them.
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 BURST ; EARLY-OPTICAL AFTERGLOWS ; MAGNETAR CENTRAL ENGINE ; INITIAL LORENTZ FACTOR ; SWIFT XRT DATA ; X-RAY ; LIGHT CURVES ; COMPREHENSIVE ANALYSIS ; WIND ENVIRONMENTS ; FIREBALL MODEL
收录类别SCI
语种英语
WOS记录号WOS:000390792000012
源URL[http://ir.bao.ac.cn/handle/114a11/6822]  
专题国家天文台_空间科学研究部
作者单位1.Guangxi Univ, Dept Phys, GXU NAOC Ctr Astrophys & Space Sci, Nanning 530004, Peoples R China
2.Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100012, Peoples R China
4.Qufu Normal Univ, Coll Phys & Engn, Qufu 273165, Peoples R China
推荐引用方式
GB/T 7714
Huang, Xiao-Li,Xin, Li-Ping,Yi, Shuang-Xi,et al. VERY BRIGHT PROMPT AND REVERSE SHOCK EMISSION OF GRB 140512A[J]. ASTROPHYSICAL JOURNAL,2016,833(1).
APA Huang, Xiao-Li.,Xin, Li-Ping.,Yi, Shuang-Xi.,Zhong, Shu-Qing.,Qiu, Yu-Lei.,...&Liang, En-Wei.(2016).VERY BRIGHT PROMPT AND REVERSE SHOCK EMISSION OF GRB 140512A.ASTROPHYSICAL JOURNAL,833(1).
MLA Huang, Xiao-Li,et al."VERY BRIGHT PROMPT AND REVERSE SHOCK EMISSION OF GRB 140512A".ASTROPHYSICAL JOURNAL 833.1(2016).

入库方式: OAI收割

来源:国家天文台

浏览0
下载0
收藏0
其他版本

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。