Restrictions on the external shock emission model in GRB 080319B

Author: José Luis Ramírez Mendiola

Abstract: GRB 080319B was one the brightest and most energetic gamma-ray burst ever detected from radio to gamma rays. It presented a optical counter part mildly correlated with the prompt emission suggesting a common physical origin. Recently, the Milagro collaboration presented upper limits to the energy flux at hundreds of GeVs. We have described the high-energy emission presented in GRB980923 and GRB090926A as synchrotron self-Compton emission in the thick case from the reverse and forward external shocks when the jet is magnetized. One evident consequence of the model is the presence of an optical early afterglow. We test our model with GRB080319B and present the results.