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26 April 2024

» arxiv » astro-ph/0206465

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The Strongly Polarized Afterglow of GRB 020405
D. Bersier ; B. McLeod ; P.M. Garnavich ; M. J. Holman ; T. Grav ; J. Quinn ; J. Kaluzny ; P. M. Challis ; R. G. Bower ; D. J. Wilman ; J. S. Heyl ; S. T. Holland ; V. Hradecky ; S. Jha ; K. Z. Stanek ;
Date:	26 Jun 2002
Journal:	Astrophys.J. 583 (2003) L63-L66
Subject:	astro-ph
Abstract:	We report polarization measurements and photometry for the optical afterglow of the gamma-ray burst GRB 020405. We measured a highly significant 9.9% polarization (in V band) 1.3 days after the burst and argue that it is intrinsic to the GRB. The light curve decay is well fitted by a $t^{-1.72}$ power-law; we do not see any evidence for a break between 1.24 and 4.3 days after the burst. We discuss these measurements in the light of several models of GRB afterglows.
Source:	arXiv, astro-ph/0206465
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