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Astron. Astrophys. Suppl. Ser. 138, 509-510

A possible connection between gamma-ray bursts and single black holes

G.M. Beskin1 - A. Shearer2 - A. Golden2 - C. Bartolini3 - A. Guarnieri3 - A. Piccioni3 - N. Masetti4

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1 - Special Astrophysical Observatory, Russia
2 - University of Galway, Ireland
3 - Dipartimento di Astronomia, Università di Bologna, via Zamboni 33, I-40126 Bologna, Italy
4 - Istituto Te.S.R.E., CNR, Bologna, Italy

Received December 18, 1998; accepted July 1, 1999


We consider Single Black Holes (SBHs) of $10^3\ M_\odot$ as possible parent objects for cosmological GRBs. The latter are the result of the energy release of SBHs magnetosphere inhomogeneities. The percolation nature of this release yields a unique power law for the GRBs energy distribution that is $E^{-\beta}$ (with $\beta=
1.7 - 1.8$), i.e. the same observed in solar flares, flare stars and X-ray sources. The number of GRBs per year per galaxy is about 10-2 - 10-1 with total energy 1047 - 1050 ergs for beaming factor of about 10-4 - 10-5.

Key words: black hole physics, gamma-rays: bursts

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