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Fig. 4

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Our numerical simulation within scenario 2, assuming that the extended afterglow is energetically predominant over the P-GRB. In this case, the predicted P-GRB (solid rectangle) is less then twice the extended afterglow. We interpret the BAT data (crosses) as the P-GRB and the XRT data as the extended afterglow. The P-GRB has just 28% of the total energy. The double-dashed line is the theoretical light curve in the band 15–150 keV, and the dot-dashed line is the theoretical light curve in the band 0.3–10 keV. The two horizontal lines are from above to below: the BAT threshold and the XRT threshold.

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