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We model multiwavelength afterglow data from the short Gamma-Ray Burst (GRB)090510 using a combined leptonic-hadronic model of synchrotron radiation froman adiabatic blast wave. High energy, >100 MeV, emission in our model isdominated by proton-synchrotron radiation, while electron-synchrotron radiationdominates in the X ray and ultraviolet wavelengths. The collimation-correctedGRB energy, depending on the jet-break time, in this model could be as low as3e51 erg but two orders of magnitude larger than the gamma-ray energy. We alsocalculated the opacities for electron-positron pair production by gamma raysand found that TeV gamma rays from proton-synchrotron radiation can escape theblast wave at early time, and their detection can provide evidence of ahadronic emission component dominating at high energies.

A leptonic-hadronic model for the afterglow of gamma-ray burst 090510