Abstract
In the framework of the popular internal shock model, paired forward and reverse shocks are generated simultaneously by collisions among relativistic shells. If the Lorentz factors of these two types of shocks are very different, the synchrotron emissions produced by them could peak at two different energy bands. We show that such a two‐component synchrotron scenario can account for the prompt optical and MeV γ‐ray emissions of GRB 080319B. The same dynamical origin of the forward and reverse shocks is consistent with the temporal coincidence between the prompt γ‐ray and optical emission components.
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