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The bright short-hard GRB 090510 was observed by both Swift and Fermitelescopes. The study of the prompt emission by Fermi revealed an additionalhigh-energy spectral component, the largest lower limit ever on the bulkLorentz factor in a short GRB jet, and brought the most stringent constraintever on linear Lorentz invariance violation models. The fast repoint andfollow-up by both telescopes allowed the first multiwavelength study of a GRBafterglow from optical range to several GeV. This long-lived emission has beenstudied in the framework of the internal shock and external shock models.

Fermi and Swift observations of the bright short GRB 090510