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We present the observations of GRB090510 performed by the Fermi Gamma-RaySpace Telescope and the Swift observatory. This is a bright, short burst thatshows an extended emission detected in the GeV range. Furthermore, its opticalemission initially rises, a feature so far observed only in long bursts, whilethe X-ray flux shows an initial shallow decrease, followed by a steeper decay.This exceptional behavior enables us to investigate the physical properties ofthe GRB outflow, poorly known in short bursts. We discuss internal shock andexternal shock models for the broadband energy emission of this object.

Swift and Fermi observations of the early afterglow of the short Gamma-Ray Burst 090510