Temporal variability in early afterglows of short gamma-ray bursts

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	Temporal variability in early afterglows of short gamma-ray bursts
	Li Z(李卓); Li, Z; Dai, ZG; Lu, T
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2003
卷号	345 期号:4 页码:1236-1240
关键词	radiation mechanisms : non-thermal relativity gamma-rays : bursts
通讯作者	Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Particle Astrophys Lab, Beijing 100039, Peoples R China
英文摘要	The shock model has successfully explained the observed behaviours of afterglows from long gamma-ray bursts (GRBs). Here, we use it to investigate the so-called early afterglows from short GRBs, which arise from blast waves that are not decelerated considerably by their surrounding medium. We consider a nearby medium loaded with e(+/-) pairs. First, the temporal behaviours show a soft-to-hard spectral evolution, from optical to hard X-ray, and then a usual hard-to-soft evolution after the blast waves begin to decelerate. The light curves show variability and consist of two peaks. The first peak, owing to the pair effect, can be observed in the X-ray, although too faint and too short in the optical. The second peak will be detected easily by Swift. We show that detections of the double-peak structure in the light curves of early afterglows are very helpful in determining all the shock parameters of short GRBs, including both the parameters of the relativistic source and the surroundings. Besides, from the requirement that the forward-shock emission in short GRBs should be below the Burst and Transient Source Experiment (BATSE) detection threshold, we give a strong constraint on the shock model parameters. In particular, the initial Lorentz factor of the source is limited to be no more than similar to10(3), and the ambient medium density n is inferred to be low, n less than or similar to 10(-1) cm(-3).
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
原文出处	SCI
语种	英语
WOS记录号	WOS:000186565900014
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/239216]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Li Z,Li, Z,Dai, ZG,et al. Temporal variability in early afterglows of short gamma-ray bursts[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2003,345(4):1236-1240.
APA	李卓,Li, Z,Dai, ZG,&Lu, T.(2003).Temporal variability in early afterglows of short gamma-ray bursts.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,345(4),1236-1240.
MLA	李卓,et al."Temporal variability in early afterglows of short gamma-ray bursts".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 345.4(2003):1236-1240.