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

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.

7 pages, 3 postscript figures, A&A in press

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• Discovery of a Transient Absorption Edge in the X-ray Spectrum of GRB 990705
• Light Curves and Spectra of Dust Echoes From Gamma-Ray Bursts and their Afterglows: Continued Evidence that GRB 970228 is Associated with a Supernova
• On the absorption feature in the prompt X-ray spectrum of GRB 990705

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