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Fig. 5.

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Distribution of bulk Lorentz factor Γ obtained from the spectral analysis of the 22 bright GRBs that were co-detected by GBM and LAT and considered for this work. The values of Γ are derived by interpreting the high-energy cutoff (either a measurement of or a lower-limit of) as a sign of pair-production opacity, following Eq. (7). The blue-filled histogram represents the measurement of Γ for the 9 GRBs of the sample showing evidence of high-energy cutoff in their prompt emission spectra. The dashed red histogram (with rightward arrows) represents the lower-limit on Γ from the 13 GRBs not showing a cutoff in their spectrum (see the text for details).

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