The Early (<1 hr) Multi Colour Afterglow of GRB 050502a with the 2-m Liverpool Telescope

Details The Early (<1 hr) Multi Colour Afterglow of GRB 050502a with the 2-m Liverpool Telescope The Early (<1 hr) Multi Colour Afterglow of GRB 050502a with the 2-m Liverpool Telescope

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006chjas...6a.330g&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Supplement, Volume 6, Issue S1, pp. 330-334 (2006).

Astronomy and Astrophysics

Astrophysics

Scientific paper

The 2-m robotic Liverpool Telescope automatically discovered the optical afterglow of the INTEGRAL gamma-ray burst GRB 050502a 3 min after the GRB onset. The automatic identification of a bright optical transient of r'~15.8 triggered for the first time a multi colour observation sequence in the BVr'i' filters during the first hour after a GRB. All the four light curves are fitted by a simple power law with index of 1.2±0.1. We also find evidence for an achromatic bump rising at t~0.02 days. We investigate different scenarios compatible with the data. We find possible evidence for a uniform circumburst medium with clumps in density, as in the case of GRB 021004. The alternative case of a wind environment cannot be ruled out, although it can hardly account for our observations. The alternative interpretation of the bump, as the result of a refreshed shock, appears to be more problematic, although it cannot be ruled out either.

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