Rest-frame distribution of Ep for 4 short (hatched histogram) and 26 long (empty histogram) GBM-GRBs. For two GRBs (GRB 090519A, GRB 080928) a simple PL model fits the data best, thus not providing an Ep value. The complete distribution has mean and median values of 1.1 MeV and 750 keV, respectively. A log-normal fit to the sample of long GRBs (dashed line) peaks at ~800 keV and has a FWHM = 0.93 in log-space.
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