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

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arxiv 0910.1629 v2 pith:KXZXSPG6 submitted 2009-10-09 astro-ph.HE

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

M. De Pasquale , P. Schady , N.P.M. Kuin , M.J. Page , P.A. Curran , S. Zane , S.R. Oates , S.T. Holland
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A. A. Breeveld E.A. Hoversten G. Chincarini D. Grupe Fermi/LAT Fermi/GBM collaborations. Minor changes in the authorlist
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keywords emissionshortburstburstsfermigamma-rayobservationsshock
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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 GRB outflow, poorly known in short bursts. We discuss internal shock and external shock models for the broadband energy emission of this object.

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  1. Deep Newtonian Afterglows: Theoretical Light Curves for Quasi-spherical Outflows

    astro-ph.HE 2026-06 unverdicted novelty 5.0

    An analytical model for multiwavelength synchrotron emission from decelerated quasi-spherical ejecta with energy injection in stratified environments is developed for the deep Newtonian regime of GRB afterglows.