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Published November 15, 2001 | Published + Submitted
Journal Article Open

The optical afterglow of GRB 000911: Evidence for an associated supernova?

Lazzati, D. ORCID icon
Covino, S.
Ghisellini, G.
Fugazza, D.
Campana, S.
Saracco, P.
Price, P. A.
Berger, E. ORCID icon
Kulkarni, S. ORCID icon
Ramirez-Ruiz, E. ORCID icon
Cimatti, A.
Della Valle, M. ORCID icon
di Serego Alighieri, S. ORCID icon
Celotti, A.
Haardt, F.
Israel, G. L.
Stella, L.
An error occurred while generating the citation.

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.

Additional Information

© 2001 ESO. Received: 12 July 2001. Accepted: 12 September 2001. We thank the ESO-ANTU service team that performed the observations. We thank the ESO Director for the allocation of discretionary time for the spectral observations performed on day 36. This program was partially supported through ASI grants. SRK thanks NSF and NASA for supporting a program of GRB investigations at Caltech.

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