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Instrumental Selection Effect on the Bimodal T90 Distribution of Gamma-Ray Bursts†

Published online by Cambridge University Press:  21 February 2013

Y. Qin ,
E. W. Liang ,
F. J. Virgili  and
B. Zhang
Y. Qin
Affiliation:
Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China; [email protected]
E. W. Liang
Affiliation:
Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China; [email protected]
F. J. Virgili
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Birkenhead, CH41 1LD
B. Zhang
Affiliation:
Department of Physics and GXU-NAOC Center for Astrophysics and Space Sciences, Guangxi University, Nanning 530004, China; [email protected] Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154
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Abstract

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The durations (T90) of 315 GRBs detected with Fermi/GBM (8-1000 keV) by 2011 September are calculated using the Bayesian Block method. We compare the T90 distributions between this sample and that observed with previous/current GRB missions. We show that T90 is energy-band dependent and the observed bimodal T90 distribution would be due to the instrumental selection effect.

Keywords

Gamma-rays: bursts – methods: statistics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 70 - 73
Copyright
Copyright © International Astronomical Union 2013

Footnotes

†

Supported by the “973” Program of China (2009CB824800), the National Natural Science Foundation of China (Grants No. 11025313), and Special Foundation for Distinguished Expert Program of Guangxi, the Guangxi Natural Science Foundation (2010GXNSFC013011, Contract No. 2011-135), and the 3th Innovation Projet of Guangxi University. BZ acknowledges support from NSF (AST-0908362).

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