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arxiv: astro-ph/0211245 · v1 · submitted 2002-11-12 · 🌌 astro-ph

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Polarization Evolution of the GRB 020405 Afterglow

S. Covino , D. Malesani , G. Ghisellini , D. Lazzati , S. di Serego Alighieri , M. Stefanon , A. Cimatti , M. Della Valle
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F. Fiore P. Goldoni N. Kawai G.L. Israel E. Le Floc'h I.F. Mirabel G. Ricker P. Saracco L. Stella G. Tagliaferri F.M. Zerbi
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classification 🌌 astro-ph
keywords polarizationobservationsafterglowangleappearsaroundburstconstant
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Polarization measurements for the optical counterpart to GRB 020405 are presented and discussed. Our observations were performed with the VLT-UT3 (Melipal) during the second and third night after the gamma-ray burst discovery. The polarization degree (and the position angle) appears to be constant between our two observations at a level around (1.5 - 2)%. The polarization can be intrinsic but it is not possible to unambiguously exclude that a substantial fraction of it is induced by dust in the host galaxy.

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