Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-26
Astrophys.J.599:1223-1237,2003
Astronomy and Astrophysics
Astrophysics
22 pages ApJ style, accepted for publication
Scientific paper
10.1086/379606
We discover a break in the GRB 011121 afterglow light curve after 1.3 days, which implies an initial jet opening angle of about 9 deg. The SED during the first four days is achromatic, and supports the jet origin of this break. The SED during the supernova bump can be best represented by a black body with a temperature of 6000 K. The deduced parameters for the decay slope as well as the spectral index favor a wind scenario, i.e. an outflow into a circum-burst environment shaped by the stellar wind of a massive GRB progenitor. Due to its low redshift of z=0.36, GRB 011121 has been the best example for the GRB-supernova connection until GRB 030329, and provides compelling evidence for a circum-burster wind region expected to exist if the progenitor was a massive star.
Andersen Michael I.
Burud Ingunn
Castro Cerón José María
Castro-Tirado Alberto J.
Fruchter Andrew
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