Curran 2008 X射线耀发的统计-和暴本身的flares一脉相承

主要内容:
所以这些flares可能是prelong的或者restarting的central engine。

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文章信息:

· arXiv e-print (arXiv:0802.3803)

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Title:		On the nature of late X-ray flares in Swift Gamma-ray Bursts
Authors:		Curran, P. A.; Starling, R. L. C.; O'Brien, P. T.; Godet, O.; van der Horst, A. J.; Wijers, R. A. M. J.
Publication:		eprint arXiv:0802.3803
Publication Date:		02/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		6 pages, 9 figures, submitted to A&A
Bibliographic Code:		2008arXiv0802.3803C

Abstract

Previously detected in only a few Gamma-ray Bursts (GRBs), X-ray flares are now observed in ~50% of all GRBs, though their origins remain unclear. Most flares are seen early on in the afterglow decay, while some bursts exhibit flares at late times of 10^4 to 10^5 seconds, which may have implications for flare models. We investigate whether a sample of late time (> 10^4 s) flares are different from previous samples of early time flares, or whether they are merely examples on the tail of the early flare distribution. We examine the X-ray light curves of Swift bursts for late flares and compare the flare and underlying power-law properties with those of early flares, and the values of these properties predicted by the blast wave model. The burst sample show late flare properties consistent with those of early flares, where the majority of the flares can be explained by either internal or external shock, though in a few cases one origin is favoured over the other. The underlying power laws are mainly consistent with the normal decay phase of the afterglow. If confirmed by the ever growing sample this would imply that, in some cases, prolonged activity out to late times or a restarting of the central engine is required.

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