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According the Collapsar model long gamma-ray bursts (LGRBs) involverelativistic jets that puncture the envelope of a collapsing star, and producedthe \gamma-rays after they break out. This model provides a theoreticalframework for the well known association between LGRBs and massive stars.However although this association is supported by a wealth of observations, tothis date there is no direct observational evidence for the emergence of thejet from the star. In other words there is no direct evidence for the Collapsarmodel. Here we show that a distinct signature of the Collapsar model is theappearance of a plateau in the duration distribution of the prompt GRB emissionat times much shorter than the typical breakout time of the jet. This plateauis evident in the data of all major GRB satellites, and provides a directevidence supporting the Collapsar model. It also enables us to place limits onthe sizes and masses of LGRB progenitors; suggests the existence of a largepopulation of choked (failed) GRBs; and indicates that the 2 s durationcommonly used to separate Collapsars and non-Collapsars holds for BATSE andpossibly Fermi GBM GRBs, but it is inconsistent with the duration distributionsof Swift GRBs.

New insights on the duration distribution of long GRBs from Collapsars