Fig. 3

Our numerical simulation within scenario 1, assuming that GRB 050509b is a “genuine” short GRB, i.e. that the P-GRB is energetically predominant over the extended afterglow. The BAT data (crosses) are interpreted as the peak of the extended afterglow. In this case, the predicted P-GRB (solid rectangle) total energy is more than twice the extended afterglow one. The solid line is the theoretical light curve in the 15–150 keV energy band, and the dashed one is the theoretical light curve in the 0.3–10 keV energy band. The dot-dashed horizontal line represents the BAT threshold and the solid horizontal one represents the XRT threshold.
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