Long and Short GRB
Abstract
We report evidence from the 3B Catalogue that short (T90 < 10 s) and long (T90 > 10 s) GRB represent different populations and processes: Their spectral behavior is qualitatively different, with short bursts harder in the BATSE range, but chiefly long bursts detected at higher photon energies; V/Vmax = 0.385 0.019 for short GRB but V/Vmax = 0.282 0.014 for long GRB, differing by 0.103 0.024. Long GRB may be the consequence of accretion-induced collapse, but this mechanism fails for short GRB, for which we suggest colliding neutron stars.
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