Fluence distributions of the FERMIGRB, FERMIGRB_BAT, and FERMIGRB_MKD samples. Left panel: Frequency histogram of the measured fluence for the sample of 3691 FERMIGRB, the bin size is ≃3.02 × 10⁻⁵ [erg/cm²], in the energy band, nominally 10-1000 keV. For visualization purposes, 12 GRB were removed from the original sample of 3703 GRB. Middle panel: Frequency histogram of the FERMIGRB_BAT sample in the BATSE standard energy band, nominally 50-300 keV. Right panel: Frequency histogram of the 2428 GRB remaining of the original FERMIGRB sample (left panel) after we remove the GRB located in the Zone of Avoidance, that is, those GRB with |b|≤20° (i.e., −20° ≤DEC ≤ +20°, see Figure 4).