Early-Time Observations of the GRB 050319 Optical Transient

Details Early-Time Observations of the GRB 050319 Optical Transient Early-Time Observations of the GRB 050319 Optical Transient

2005-11-15

arxiv.org/abs/astro-ph/0511421v1

Astrophys.J.640:402-406,2006

Astronomy and Astrophysics

Astrophysics

14 pages including 2 figures; Accepted for publication in ApJ

Scientific paper

10.1086/499803

We present the unfiltered ROTSE-III light curve of the optical transient associated with GRB 050319 beginning 4 s after the cessation of gamma-ray activity. We fit a power-law function to the data using the revised trigger time given by Chincarini et al. (2005), and a smoothly broken power-law to the data using the original trigger disseminated through the GCN notices. Including the RAPTOR data from Wozniak et al. (2005), the best fit power-law indices are alpha=-0.854 (+/- 0.014) for the single power-law and alpha_1=-0.364 (+/- 0.020), alpha_2= -0.881 (+/- 0.030), with a break at t_b = 418 (+/- 30) s for the smoothly broken fit. We discuss the fit results with emphasis placed on the importance of knowing the true start time of the optical transient for this multi-peaked burst. As Swift continues to provide prompt GRB locations, it becomes more important to answer the question, "when does the afterglow begin" to correctly interpret the light curves.

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