Early GRB Afterglows from Relativistic Blast Waves in General Radiative Regimes

Details Early GRB Afterglows from Relativistic Blast Waves in General Radiative Regimes Early GRB Afterglows from Relativistic Blast Waves in General Radiative Regimes

1999-07-20

arxiv.org/abs/astro-ph/9907270v2

Astronomy and Astrophysics

Astrophysics

Now accepted for publication in ApJ, part I (originally submitted to ApJ Letters). Extended discussion w.r.t. original version

Scientific paper

10.1086/308580

We present simple analytical expressions for the predicted spectral and temporal behavior of the early afterglow radiation from gamma-ray bursts in radiative regimes intermediate between the adiabatic and the fully radiative solutions of the blastwave hydrodynamic equations. Our expressions are valid as long as the relativistic electrons responsible for the observed synchrotron emission are in the fast cooling regime and the blast wave is relativistic. We show that even a slight deviation from a perfectly adiabatic evolution results in significant changes of the temporal characteristics of the afterglow emission.

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