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The duration properties of Swift Gamma-Ray Bursts

Published online by Cambridge University Press:  01 April 2008

Z.-B. Zhang  and
C.-S. Choi
Z.-B. Zhang
Affiliation:
International Center for Astrophysics, Korea Astronomy and Space Science Institute, 36-1 Hwaam, Yusong, Daejon 305-348, South Korea; email: z-b-zhang@163.com Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, P. O. Box 110, Kunming 650011, China
C.-S. Choi
Affiliation:
International Center for Astrophysics, Korea Astronomy and Space Science Institute, 36-1 Hwaam, Yusong, Daejon 305-348, South Korea; email: z-b-zhang@163.com
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Abstract

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We report the systematic analysis of the durations for Swift gamma-ray bursts (GRBs) and compare the results with those of pre-Swift data. We show that the durations of Swift bursts also have two log-normal distributions that are clearly divided at T90 = 2 s. Their intrinsic durations also show a bimodal distribution but shift systematically toward the smaller value compared with the observed one. This study confirms the spectra of short GRBs are in general harder than the long GRBs and shows that this trend becomes weak in the source frame.

Keywords

gamma-rays: bursts – gamma rays: theory
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 431 - 432
Copyright
Copyright © International Astronomical Union 2008

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