The Anomalous Early Afterglow of GRB 050801

Details The Anomalous Early Afterglow of GRB 050801 The Anomalous Early Afterglow of GRB 050801

2006-01-16

arxiv.org/abs/astro-ph/0601350v1

Astrophys.J.638:L5-L8,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure. Accepted for publication in ApJ Letters

Scientific paper

10.1086/501007

The ROTSE-IIIc telescope at the H.E.S.S. site, Namibia, obtained the earliest detection of optical emission from a Gamma-Ray Burst (GRB), beginning only 21.8 s from the onset of Swift GRB 050801. The optical lightcurve does not fade or brighten significantly over the first ~250 s, after which there is an achromatic break and the lightcurve declines in typical power-law fashion. The Swift/XRT also obtained early observations starting at 69 s after the burst onset. The X-ray lightcurve shows the same features as the optical lightcurve. These correlated variations in the early optical and X-ray emission imply a common origin in space and time. This behavior is difficult to reconcile with the standard models of early afterglow emission.

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