2004AJ....127..252B -
Astron. J., 127, 252-263 (2004/January-0)
Optical-infrared ANDICAM observations of the transient associated with GRB 030329.
BLOOM J.S., VAN DOKKUM P.G., BAILYN C.D., BUXTON M.M., KULKARNI S.R. and SCHMIDT B.P.
Abstract (from CDS):
We present photometry of the transient associated with γ-burst (GRB) 030329 obtained with the Cerro Tololo Inter-American Observatory 1.3 meter telescope and the ANDICAM instrument, a dual optical/infrared imager. Without the need for light-curve interpolation to produce snapshot broadband spectra, we show that the transient spectrum remained statistically achromatic from day 2.7 to day 5.6, during a rebrightening episode. Associating the light in these early epochs with the GRB afterglow, we infer a modest level of extinction due to the host galaxy in the line of sight toward the GRB: AV(host)=0.30±0.03 mag for β=-0.5 and AV(host)<0.4 mag (3 σ) for any physically plausible value of β (with flux fν∝λ–β). We conclude that the spectral slope of the afterglow component was more than β=-0.8 between day 2.7 and 5.6 after the GRB, excluding the possibility that the synchrotron cooling break passed through the optical/IR bandpass over that period. Taking extinction into account, a decomposition of the light curve into an afterglow and supernova component requires the presence of a supernova (SN) similar to that of SN 1998bw, an afterglow that shows some evidence for a second break around day 8-10 and a fifth rebrightening event around day 15. Assuming a, SN 1988bw-like evolution and a contemporaneous GRB and SN event, the peak SN brightness was MV=(-19.8±0.4)-5logh65 mag.
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Journal keyword(s):
Gamma Rays - Stars: Supernovae: Individual: Alphanumeric: SN 1998bw - Stars: Supernovae: Individual: Alphanumeric: SN 2003dh
Simbad objects:
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