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Physical properties of rapidly decayingAfterglows

Published online by Cambridge University Press:  22 July 2013

M. De Pasquale ,
S. Schulze ,
D.A. Kann ,
S. Oates  and
B. Zhang
M. De Pasquale
Affiliation:
Department of Physics & Astronomy, University of Nevada, Las Vegas, USA
S. Schulze
Affiliation:
Pontificia Universidad Católica de Chile, Chile
D.A. Kann
Affiliation:
Thüringer Landessternwarte Tautenburg and Max-Planck-Institut für extraterrestrische Physik, Germany
S. Oates
Affiliation:
Mullard Space Science Laboratory, University College London, UK
B. Zhang
Affiliation:
Department of Physics & Astronomy, University of Nevada, Las Vegas, USA
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Abstract

We analyze a sample of Swift X-ray and optical GRB afterglows which werechosen so as to reduce selection effects against the weakest events. We tentativelyidentify important differences in GRBs that show a fast decay with respect to the averageGRB, in particular a tendency for the more energetic bursts to have a steeper afterglowdecline. An explanation to this finding could be bursts in a wind environment are onaverage more energetic than bursts occurring in a constant density medium.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 61: Gamma-ray Bursts: 15 Years of GRB Afterglows – Progenitors, Environments and Host Galaxies from the Nearby to the Early Universe , 2013 , pp. 217 - 221
Copyright
© EAS, EDP Sciences 2013

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