Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-26
Astrophys.J. 583 (2003) L63-L66
Astronomy and Astrophysics
Astrophysics
submitted to ApJL
Scientific paper
10.1086/368158
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.
Bersier David
Bower Richard G.
Challis Peter M.
Garnavich Peter M.
Grav Tommy
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