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We compare the prompt intrinsic spectral properties of a sample of shortGamma--ray Burst (GRB) with the first 0.3 seconds (rest frame) of long GRBsobserved by Fermi/GBM. We find that short GRBs and the first part of long GRBslie on the same E_p--E_iso correlation, that is parallel to the relation forthe time averaged spectra of long GRBs. Moreover, they are indistinguishable inthe E_p--L_iso plane. This suggests that the emission mechanism is the same forshort and for the beginning of long events, and both short and long GRBs arevery similar phenomena, occurring on different timescales. If the centralengine of a long GRB would stop after ~0.3 * (1+z) seconds the resulting eventwould be spectrally indistinguishable from a short GRB.

There is a short gamma-ray burst prompt phase at the beginning of each long one