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Greiner, J; Klose, S; Salvato, M; Zeh, A; Schwarz, R; Hartmann, D H; Masetti, N; Stecklum, B; Lamer, G; Lodieu, N; Scholz, R D; Sterken, C; Gorosabel, J; Burud, I; Rhoads, J; Mitrofanov, I; Litvak, M; Sanin, A; Grinkov, V; Andersen, M I; Castro Cerón, J M; Castro-Tirado, A J; Fruchter, A; Fynbo, J U; Hjorth, J; Kaper, L; Kouveliotou, C; Palazzi, E; Pian, E; Rol, E; Tanvir, N R; Vreeswijk, P M; R A M J Wijers; van den Heuvel, E
arXiv.org, 09/2003Paper
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.
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