%0 Journal Article
%T The Strongly Polarized Afterglow of GRB 020405
%A D. Bersier
%A B. McLeod
%A P. M. Garnavich
%A M. J. Holman
%A T. Grav
%A J. Quinn
%A J. Kaluzny
%A P. M. Challis
%A R. G. Bower
%A D. J. Wilman
%A J. S. Heyl
%A S. T. Holland
%A V. Hradecky
%A S. Jha
%A K. Z. Stanek
%J Physics
%D 2002
%I arXiv
%R 10.1086/368158
%X 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.
%U http://arxiv.org/abs/astro-ph/0206465v1