GRB Afterglow Light Curves from a Hydrodynamic Model

Abstract

In this work, we have modeled the hydrodynamic evolution of the GRBs fireball in violent interaction with the external medium (the ISM) surrounding the burst source by assuming a power law distribution of the accelerated relativistic electrons. For this purpose, a computer code based only on the contribution of the predominant synchrotron radiation mechanism was developed. Light curves for the afterglow emissions following several GRBs over the X-ray and the visible R frequency bands were calculated. Their comparison to observed data by the XRT/Swift satellite and Earth telescopes, respectively, points out fair overall agreements, thus confirming the validity of our hydrodynamic simulation based on the model of Feng et al. (2002).