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Gamma-ray bursts (GRBs) show a bimodal distribution of durations, separatedat a duration of ~2 s. Observations have confirmed the association of long GRBswith the collapse of massive stars. The origin of short GRBs is still beingexplored. We examine constraints on the emission region size in short and longGRBs detected by Fermi/GBM. We find that the emission region size during theprompt emission, R, and the burst duration, T$_{90}$, are consistent with therelation R ~ c x T$_{90}$, for both long and short GRBs. We find thecharacteristic size for the prompt emission region to be ~2 x 10$^{10}$ cm, and~4 x 10$^{11}$ cm for short and long GRBs, respectively.

A size-duration trend for gamma-ray burst progenitors