GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE

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	GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE
	Zhang, Bin-Bin 1; Fan, Yi-Zhong2,3 ; Shen, Rong-Feng 4; Xu, Dong 5,6; Zhang, Fu-Wen 7; Wei, Da-Ming2,3 ; Burrows, David N.1; Zhang, Bing 8; Gehrels, Neil 9
刊名	ASTROPHYSICAL JOURNAL
	2012-09-10
卷号	756 期号:2 页码:190(6pp)
关键词	gamma-ray burst: general X-rays: general
ISSN号	0004-637X
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).
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]	AFTERGLOW LIGHT CURVES ; SHOCK BREAKOUT ; LORENTZ-FACTOR ; SPECTRAL EVOLUTION ; RELATIVISTIC JETS ; PROMPT EMISSION ; SUPERNOVA ; GRB-060218 ; LONG ; TELESCOPE
收录类别	SCI
语种	英语
WOS记录号	WOS:000309048200086
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8087]
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.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):190(6pp).
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),190(6pp).
MLA	Zhang, Bin-Bin,et al."GRB 120422A: A LOW-LUMINOSITY GAMMA-RAY BURST DRIVEN BY A CENTRAL ENGINE".ASTROPHYSICAL JOURNAL 756.2(2012):190(6pp).