LogN − LogF of the 432 GRBs analyzed in this work (Tables 2 and 3). Short GRBs (73 events) and long GRBs (359 events) are shown with (red) triangles and (blue) circles, respectively. The black histogram refers to the entire sample. The dashed and dot-dashed lines are two power-laws with slope –3/2. The fluence F in erg/cm² is obtained by integrating the best-fit model in the 8 keV–1 MeV energy range.