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We study the afterglow phases of a GRB through relativisticmagnetohydrodynamic simulations. The evolution of a relativistic shellpropagating into a homogeneous external medium is followed. We focus on theeffect of the magnetization of the ejecta on the initial phases of theejecta-external medium interaction. In particular we are studying the conditionfor the existence of a reverse shock into the ejecta, the timescale for thetransfer of the energy from the shell to the shocked medium and the resultingmultiwavelength light curves. To this end, we have developed a novel scheme toinclude non-thermal processeses which is coupled to the relativisticmagnetohydrodynamic code MRGENESIS in order to compute the non-thermalsynchrotron radiation.

An RMHD study of transition between prompt and afterglow GRB phases