Gamma-ray bursts from the final stage of primordial black hole evaporations
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It is now accepted that within the Standard Model of particles the evaporating primordial black holes cannot produce the detectable gamma-ray bursts because the expected photon flux from black-hole explosions is too weak, and consists mainly of GeV photons. Contrary to this verdict, we put forward a scenario, in which a large fraction of black-hole power is converted into the photon luminosity in the MeV spectral range, producing a burst of duration 10 -1 -10 3 s. We show that some of the gamma-ray bursts detected by BATSE can be associated with evaporating black holes. 1998 COSPAR. Published by Elsevier Science Ltd.