Swift and Fermi observations of the early afterglow of the short gamma-ray burst 090510
Pasquale, M De ; Schady, P. ; De Pasquale, M. ;
Feb - 2010
ISSN : 2041-8205 ;
journal : The Astrophysical Journal

Issue : 2
type: Article Journal

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

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