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The "Fireshell" model in the Swift era

We here re-examine the validity of the constant-index power-law relation between the fireshell Lorentz gamma factor and its radial coordinate, usually adopted in the current Gamma-Ray Burst (GRB) literature on the grounds of an "ultrarelativistic" approximation. Such expressions are found to be mathematically correct but only approximately valid in a very limited range of the physical and astrophysical parameters and in an asymptotic regime which is reached only for a very short time, if any.

preprint2008arXivOpen access
Carlo Luciano BiancoRemo Ruffini
astro-ph
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Carlo Luciano BiancoRemo Ruffini

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