Abstract
In this paper we investigate the variability of the gamma ray burst light curve. It is generally known that this fluctuation arise in the second phase of a GRB event, when two shock waves of different Lorentz factors collide. This is so called internal shock scenario. We have developed a simple model which includes dynamical and radiating part, to simulate shock wave evolution and collision. By specifying the model parameters, we show that this scenario could be used to describe variability of GRB light curve. We then use the model to simulate peeks in several different long GRB events from the BATSE database, which show us that some of the basic parameters have a very narrow range of values.
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