Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20313203s&link_type=abstract
American Astronomical Society Meeting 203, #132.03; Bulletin of the American Astronomical Society, Vol. 35, p.1418
Other
Scientific paper
We present extensive optical photometry of the afterglow of gamma-ray burst (GRB) 030329 and its associated supernova (SN) 2003dh starting 50 days after detection. The light curve is shown to closely resemble those of SN 1998bw, a peculiar Type Ic SN associated with GRB 980425. We observed a striking feature (``Jitter Episode'') in the late R-band light curve starting about 50 days after the burst. The light curve is seen to vary on timescales of about 2 days by more than 0.3 mag. Such variations more than 50 days after the burst (>40 days in the rest frame) are unlikely to be in the supernova component, as such variations have never been observed in any other supernova. It is much more likely that the afterglow of the GRB has exhibited another episode of re-brightening, possibly due to interaction with SN1987A-like rings ejected long ago from the progenitor. Alternatively, the early afterglow had a complicated light curve, possibly due to refreshed shocks, and this late ``Jitter Episode'' could be somehow related to that earlier behavior. We continue observing GRB 030329/SN 2003dh and will report preliminary results at the meeting.
Bersier David
Garnavich Peter M.
Holland Stephen T.
Matheson Thomas
Stanek Kris Z.
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