A model of gamma-ray bursts

We present a model that reproduces the basic spectral properties of classical gamma-ray bursts with essentially no free parameters. It is an elaboration of the scenario for cosmological gamma-ray bursts outlined by Duncan & Thompson. The starting point is a Poynting-flux-dominated, relativistic, MHD wind of extremely high luminosity, L ~ 1050 erg s –1 The compactness parameter measured at ·the base of the wind exceeds that of the Crab pulsar, or that of a luminous AGN, by a factor of ~ 1012. The wind emanates from a rapidly rotating neutron star, or neutron disc, in which a poloidal field ≳ 1014 G has been generated by a helical dynamo. Scenarios that could produce such an object include a failed Type Ib supernova, accretion-induced collapse of a white dwarf, or perhaps a binary neutron star merger.

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