GRB 011121: Jet, wind and supernova -- all in one

Details GRB 011121: Jet, wind and supernova -- all in one GRB 011121: Jet, wind and supernova -- all in one

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..263g&link_type=abstract

Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he

Astronomy and Astrophysics

Astronomy

Scientific paper

We report optical and near-infrared follow-up observations of GRB 011121. We discover a break in the afterglow light curve after 1.3 days, which implies an initial jet opening angle of ˜9°. The jet origin of this break is supported by the achromatic spectral energy distribution. During later phases, GRB 011121 shows significant excess emission above the flux predicted by a power law decline, interpreted as light from an underlying supernova. 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 is the so far best example for the GRB-supernova connection, and provides compelling evidence for a circum-burster wind region expected to exist if the progenitor was a massive star.

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