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Fig. 6

image

Cumulative distribution of Γ0 for GRBs with measured tp (red solid line). The distribution of lower limits , derived for GRBs with an upper limit on the onset time , is shown by the dashed black curve (with rightward arrows). Assuming tpTp the distribution of upper limits on Γ0 is shown by the dotted grey line (with leftward arrows). The most stringent limit on the distribution of Γ0 is shown by the green solid line which assumes that deceleration radius RdecR(τ = 1), that is, the transparency radius (Eq. (16)). Joining estimates of Γ0 and lower limits the reconstructed (through the KM estimator) distribution of Γ0 is shown by the solid black line (and its 95% uncertainty by the yellow shaded region). The distributions are normalised to their respective number of elements. The two panels (right and left, respectively) show the case of a homogeneous (s = 0) and wind (s = 2) medium.

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