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Suzaku Wide-band All-sky Monitor measurements of duration distributions of gamma-ray bursts

Yamaoka, Kazutaka; Fukazawa, Yasushi; Hanabata, Yoshitaka +25 more

We report on the T₉₀ and T₅₀ duration distributions and their relations with spectral hardness using 1464 gamma-ray bursts (GRBs), which were observed by the Suzaku Wide-band All-sky Monitor (WAM) from 2005 August 4 to 2010 December 29. The duration distribution is clearly bimodal in three energy ranges (50-120, 120-250, and …