Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-15
Astron.Astrophys.422:121-128,2004
Astronomy and Astrophysics
Astrophysics
7 pages, 5 postscript figures, minor revisions according to the referee comments. A&A in press
Scientific paper
10.1051/0004-6361:20035951
The polarization curve of GRB 020813 is discussed and compared to different models for the structure, evolution and magnetisation properties of the jet and the interstellar medium onto which the fireball impacts. GRB 020813 is best suited for this kind of analysis for the smoothness of its afterglow light curve, ensuring the applicability of current models. The polarization dataset allows us to rule out the standard GRB jet, in which the energy and Lorentz factor have a well defined value inside the jet opening angle and the magnetic field is generated at the shock front. We explore alternative models finding that a structured jet or a jet with a toroidal component of the magnetic field can fit equally well the polarization curve. Stronger conclusions cannot be drawn due to the incomplete sampling of the polarization curve. A more dense sampling, especially at early times, is required to pin down the structure of the jet and the geometry of its magnetic field.
Castro Cerón José María
Castro-Tirado Alberto J.
Covino Stefano
Della Valle Massimo
di Serego Alighieri Sperello
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