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On the Reclassification of Short GRBs

Published online by Cambridge University Press:  21 February 2013

Zhibin Zhang ,
Yongfeng Huang  and
Hongchao Liu
Zhibin Zhang
Affiliation:
Department of Physics, College of Sciences, Guizhou University, Guiyang 550025, China; email: sci.zbzhang@gzu.edu.cn
Yongfeng Huang
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China email: hyf@nju.edu.cn
Hongchao Liu
Affiliation:
Department of Physics, College of Sciences, Guizhou University, Guiyang 550025, China; email: sci.zbzhang@gzu.edu.cn
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Abstract

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By collecting 17 short gamma-ray bursts with necessary data, we find a correlation of Lp ∝ Ep,i1.7, which is very consistent with that derived from a greatly expanded sample of 148 Swift long gamma-ray bursts. It is argued that the radiation mechanism of both long and short gamma-ray bursts should be similar, i.e., of quasi-thermal origin caused by the photosphere and the dissipation occurring very near the central engine. In addition, we suggest that the Ep,i-Lp relation can be used to identified a burst among normal short bursts, short bursts with extended emission and long bursts with short-hard properties. We also find the ratio of peak energy to fluence in the prompt γ-ray band is a prospective discriminator, similar to the traditional duration time.

Keywords

Gamma-ray burst: generalRadiation mechanisms: generalMethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 361 - 363
Copyright
Copyright © International Astronomical Union 2013

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