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Characteristic Variability Time Scales of Long Gamma-Ray Bursts

Published online by Cambridge University Press:  26 May 2016

Rongfeng Shen  and
Liming Song
Rongfeng Shen
Affiliation:
Laboratory of Cosmic Rays and High Energy Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
Liming Song
Affiliation:
Laboratory of Cosmic Rays and High Energy Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China

Abstract

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We determine the characteristic variability time scales for 410 bright long GRBs by locating the maximums of their Power Density Spectra (PDSs) defined and calculated in the time domain. The averaged characteristic variability time scale decreases with peak fluxe. This is consistent with the time dilation effect expected by cosmological origin of GRBs. The occurrence distribution of the characteristic variability time scale shows bimodality, which might be interpreted as that the long GRB sample is composed of two sub-classes with different intrinsic characteristic variability time scales.

Type
Part 9 Gamma Ray Bursters
Information
Symposium - International Astronomical Union , Volume 214: High Energy Processes and Phenomena in Astrophysics , 2003 , pp. 339 - 340
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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