The optical afterglow of GRB 000911: evidence for an associated supernova?
D. Lazzati, S. Covino, G. Ghisellini, D. Fugazza, S. Campana, P. Saracco, P. A. Price, E. Berger, S. Kulkarni, E. Ramirez-Ruiz, A. Cimatti, M. Della Valle, S. di Serego Alighieri, A. Celotti, F. Haardt, G. L. Israel, L. Stella
Abstract
We present photometric and spectroscopic observations of the late afterglow of GRB 000911, starting ~1 day after the burst event and lasting ~8 weeks. We detect a moderately significant re-brightening in the R, I and J lightcurves, associated with a sizable reddening of the spectrum. This can be explained through the presence of an underlying supernova, outshining the afterglow ~30 days after the burst event. Alternative explanations are discussed.
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