An RMHD study of transition between prompt and afterglow GRB phases

Details An RMHD study of transition between prompt and afterglow GRB phases An RMHD study of transition between prompt and afterglow GRB phases

2008-01-09

arxiv.org/abs/0801.1325v1

PoS SUPERNOVA:021,2007

Astronomy and Astrophysics

Astrophysics

10 pages, 3 figures, proceedings of the conference "Supernovae: lights in the darkness", October 3-5, 2007, Mao (Menorca)

Scientific paper

We study the afterglow phases of a GRB through relativistic magnetohydrodynamic simulations. The evolution of a relativistic shell propagating into a homogeneous external medium is followed. We focus on the effect of the magnetization of the ejecta on the initial phases of the ejecta-external medium interaction. In particular we are studying the condition for the existence of a reverse shock into the ejecta, the timescale for the transfer of the energy from the shell to the shocked medium and the resulting multiwavelength light curves. To this end, we have developed a novel scheme to include non-thermal processeses which is coupled to the relativistic magnetohydrodynamic code MRGENESIS in order to compute the non-thermal synchrotron radiation.

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