Shao 2010 150个有红移的Swift暴的统计

主要内容:
统计包括光变，光子谱指数和红移分布。红移按泊松分布，光子谱在prompt阶段和余辉阶段有个变化，光变在prompt阶段有个平台（意味着中心引擎此时输出的功率一定）。

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Title:		Underlying global features of the X-ray light curves of Swift GRBs
Authors:		Shao, Lang; Fan, Yi-Zhong; Wei, Da-Ming
Publication:		eprint arXiv:1006.0286
Publication Date:		06/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		17 pages, 4 figures
Bibliographic Code:		2010arXiv1006.0286S

Abstract

With its rapid-response, {\it Swift} has revealed plenty of unexpected properties of gamma-ray bursts (GRBs). Primarily, our current understandings are challenged by the observed complex early X-ray light curves. In this {\it Letter}, based on the public {\it Swift} data of 150 well monitored GRBs with measured redshifts, we find some interesting global features of the X-ray light curves in the rest frame. The distinct spectral behaviors between the prompt emission and the afterglow emission implies dissimilar radiation scenarios. Interestingly, an unforeseen plateau is exhibited in the prompt X-ray light curves despite of being full of spikes, which might reveal a steady central engine. In addition, the redshift distribution for the 150 bursts also reveals a Possion quality.

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