Basak, Rupal 2011 暴本身光变的Timing分析

主要内容:
应用于Fermi时代最亮的暴 090618
说还可以作为标准烛光。

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Title:		Measuring the pulse of GRB 090618: A Simultaneous Spectral and Timing Analysis of the Prompt Emission
Authors:		Basak, Rupal; Rao, A. R.
Publication:		eprint arXiv:1110.1994
Publication Date:		10/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		18 pages, 4 tables, 11 figures, accepted for publication in ApJ
Bibliographic Code:		2011arXiv1110.1994R

Abstract

We develop a new method for simultaneous timing and spectral studies of Gamma Ray Burst (GRB) prompt emission and apply it to make a pulse-wise description of the prompt emission of GRB 090618, the brightest GRB detected in the Fermi era. We exploit the large area (and sensitivity) of Swift/BAT and the wide band width of Fermi/GBM to derive the parameters for a complete spectral and timing description of the individual pulses of this GRB, based on the various empirical relations suggested in the literature. We demonstrate that this empirical model correctly describes the other observed properties of the burst like the variation of the lag with energy and the pulse width with energy. The measurements also show an indication of an increase in pulse width as a function of energy at low energies for some of the pulses, which is naturally explained as an off-shoot of some particular combination of the model parameters. We argue that these model parameters, particularly the peak energy at the beginning of the pulse, are the natural choices to be used for correlation with luminosity. The implications of these results for the use of GRBs as standard candles are briefly described.

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