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Fig. 4


Distribution of the duration T90. Top: distribution of durations derived from BATSE (violet) and Fermi/GBM (red) light curves in the 50−300 keV band (c.f. Kouveliotou et al. 1993; Paciesas et al. 2012). Middle: T90 durations derived using Swift/BAT instrument on 15−150 keV (c.f. Sakamoto et al. 2011). Bottom: distribution of durations for 20−200 keV light curves obtained from IBIS/ISGRI.

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