AAS 207th Meeting, 8-12 January 2006
Session 158 GRB: Short Bursts and Panchromatic Observations
Oral, Wednesday, 2:00-3:30pm, January 11, 2006, Virginia

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[158.02] Short gamma ray bursts of an electromagnetic overcritical gravitational collapse

S.-S. Xue, R. Ruffini, F. Fraschetti, L. Vitagliano (ICRA, U. Romo, Italy)

We present theoretical predictions for the spectral, temporal and intensity signatures of the electromagnetic radiation emitted during the process of the gravitational collapse of a stellar core to a black hole, during which electromagnetic field strengths rise over the critical value for e+e- pair creation. The last phases of this gravitational collapse are studied, leading to the formation of a black hole with a subcritical electromagnetic field, likely with zero charge, and an outgoing pulse of initially optically thick e+e--photon plasma. Such a pulse reaches transparency at Lorentz gamma factors of 102--104. We find a clear signature in the outgoing electromagnetic signal, drifting from a soft to a hard spectrum, on very precise time-scales and with a very specific intensity modulation. The relevance of these theoretical results for the understanding of short gamma-ray bursts is shown

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