Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-02
Astron.J.127:252-263,2004
Astronomy and Astrophysics
Astrophysics
Published in the Astronomical Journal, January 2004: see http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2004AJ....127
Scientific paper
10.1086/380229
We present photometry of the transient associated with GRB 030329 obtained with the CTIO 1.3--meter telescope and the ANDICAM instrument, a dual optical/infrared imager with a dichroic centered at one micron. 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 re-brightening 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: A_V(host) = 0.30 +/- 0.03 mag for beta = -0.5 and A_V(host) < 0.4 mag (3 sigma) for any physically plausible value of beta (with flux f_nu ~ lambda^-beta). We conclude that the spectral slope of the afterglow component was more than beta = -0.8 between day 2.7-5.6 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 similar to that of SN 1998bw, an afterglow that shows some evidence for a second break around day 8-10, and a fifth re-brightening event around day 15. Assuming an SN 1988bw-like evolution and a contemporaneous GRB and SN event, the peak SN brightness was M_V = -19.8 +/- 0.4 - 5 log h_65 mag.
Bailyn Charles D.
Bloom Josh S.
Buxton Michelle M.
Kulkarni Sanjeev R.
Schmidt Brian P.
No associations
LandOfFree
Optical-Infrared ANDICAM Observations of the Transient Associated with GRB 030329 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Optical-Infrared ANDICAM Observations of the Transient Associated with GRB 030329, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical-Infrared ANDICAM Observations of the Transient Associated with GRB 030329 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-273423