High Quality Early Time Light Curves of GRB 060206: Implications for Gamma Ray Burst Environments and Energetics

Details High Quality Early Time Light Curves of GRB 060206: Implications for Gamma Ray Burst Environments and Energetics High Quality Early Time Light Curves of GRB 060206: Implications for Gamma Ray Burst Environments and Energetics

2006-03-08

arxiv.org/abs/astro-ph/0603181v1

Astrophys.J.648:1125-1131,2006

Astronomy and Astrophysics

Astrophysics

9 pages, 5 figures, Submitted to ApJ

Scientific paper

10.1086/506170

The 2-m robotic Liverpool Telescope (LT) reacted promptly to the high-redshift (z=4.048) gamma-ray burst GRB 060206. The afterglow was identified automatically and multicolor r'i'z' imaging was triggered without human intervention. Combining our data with those obtained from later follow-ups provides a well-sampled optical light-curve from 5 minutes to >2d after the gamma event. The light-curve is highly structured with at least three bumps evident in the first 75 minutes, including a major rebrightening (Delta_r'=-1.6 at t=3000s), interpreted as late energy injection. At early time (t=440s), we find evidence for fast (Delta t_(rest)<4s<

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