Bibcode
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.; Salamanca, I.; Tanvir, N. R.; Vreeswijk, P. M.; Wijers, R. A. M. J.; van den Heuvel, E.
Referencia bibliográfica
Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference held 17-20 September 2002, in Rome, Italy. Edited by M. Feroci, F. Frontera, N. Masetti, and L. Piro. San Francisco: Astronomical Society of the Pacific, 2004., p.263
Fecha de publicación:
6
2004
Número de citas
1
Número de citas referidas
1
Descripción
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.