Fig. 3
Evolution of the Lorentz Γ factor until the transparency emission for a GRB of a fixed 
= 1.22 × 1055 (upper panel), and = 1.44 × 1049, for different values of the baryon load B. This computation refers to a mass of the black hole of 10 M⊙ and a τ = 
, where σT is the Thomson cross-section and the integration is over the thickness of the fireshell (Ruffini 1999).
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