GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE
文献类型：期刊论文
| 作者 | Zhang, Bin-Bin1; Fan, Yi-Zhong2,3; Shen, Rong-Feng4; Xu, Dong5,6; Zhang, Fu-Wen7; Wei, Da-Ming2,3; Burrows, David N.1; Zhang, Bing8; Gehrels, Neil9 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-09-10 |
| 卷号 | 756期号:2 |
| 关键词 | gamma-ray burst: general X-rays: general |
| 英文摘要 | GRB 120422A is a low-luminosity gamma-ray burst (GRB) associated with a bright supernova, which distinguishes itself by its relatively short T-90 (similar to 5 s) and an energetic and steep-decaying X-ray tail. We analyze the Swift Burst Alert Telescope and X-ray Telescope data and discuss the physical implications. We show that the steep decline early in the X-ray light curve can be interpreted as the curvature tail of a late emission episode around 58-86 s, with a curved instantaneous spectrum at the end of the emission episode. Together with the main activity in the first similar to 20 s and the weak emission from 40 s to 60 s, the prompt emission is variable, which points to a central engine origin in contrast to a shock-breakout origin, which is used to interpret some other nearby low-luminosity supernova GRBs. Both the curvature effect model and interpreting the early shallow decay as the coasting external forward shock emission in a wind medium provide a constraint on the bulk Lorentz factor Gamma to be around several. Comparing the properties of GRB 120422A and other supernova GRBs, we find that the main criterion to distinguish engine-driven GRBs from shock-breakout GRBs is the time-averaged gamma-ray luminosity. Engine-driven GRBs likely have a luminosity above similar to 10(48) erg s(-1). |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000309048200086 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6285]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA 2.Nanjing Univ, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China 4.Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H4, Canada 5.Weizmann Inst Sci, Benoziyo Ctr Astrophys, Fac Phys, IL-76100 Rehovot, Israel 6.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 7.Guilin Univ Technol, Coll Sci, Guilin 541004, Guangxi, Peoples R China 8.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA 9.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA |
| 推荐引用方式 GB/T 7714 | Zhang, Bin-Bin,Fan, Yi-Zhong,Shen, Rong-Feng,et al. GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE[J]. ASTROPHYSICAL JOURNAL,2012,756(2). |
| APA | Zhang, Bin-Bin.,Fan, Yi-Zhong.,Shen, Rong-Feng.,Xu, Dong.,Zhang, Fu-Wen.,...&Gehrels, Neil.(2012).GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE.ASTROPHYSICAL JOURNAL,756(2). |
| MLA | Zhang, Bin-Bin,et al."GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE".ASTROPHYSICAL JOURNAL 756.2(2012). |
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来源：国家天文台
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