Ukwatta 2009 Swift暴的Variability

主要内容:


精彩摘抄:

From pictures

可以从对光变的FFT得到一个特征时标(在~10Hz处的拐折处)

From pictures

之间有一点关系, 貌似"频率"越高的越亮.

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Title:		Variability in the Prompt Emission of Swift-BAT Gamma-Ray Bursts
Authors:		Ukwatta, T. N.; Dhuga, K. S.; Parke, W. C.; Sakamoto, T.; Markwardt, C. B.; Barthelmy, S. D.; Cioffi, D. F.; Eskandarian, A.; Gehrels, N.; Maximon, L.; Morris, D. C.
Publication:		eprint arXiv:0906.3193
Publication Date:		06/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		4 pages; Submitted to Proceedings of NS-GRB Conference in Egypt 2009 (4 pages, 5 figures)
Bibliographic Code:		2009arXiv0906.3193U

Abstract

We present the results of our study of the variability time scales of a sample of 27 long Swift Gamma-Ray Bursts (GRBs) with known redshifts. The variability time scale can help our understanding of fundamental GRB parameters such as the initial bulk Lorentz factor and the characteristic size associated with the emission region. Fast Fourier Transform (FFT) techniques were used to extract a noise threshold crossing frequency, which we associate with a variability time scale. The threshold frequency appears to show a correlation with the peak isotropic luminosity of GRBs.

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