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Published online by Cambridge University Press: 21 February 2013
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.
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).