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28 March 2024
 
  » arxiv » astro-ph/0601350

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The Anomalous Early Afterglow of GRB 050801
E. S. Rykoff ; V. Mangano ; S. A. Yost ; R. Sari ; F. Aharonian ; C. W. Akerlof ; M. C. B. Ashley ; S. D. Barthelmy ; D. N. Burrows ; N. Gehrels ; E. Gogus ; D. Horns ; U. Kiziloglu ; H. A. Krimm ; T. A. McKay ; M. Ozel ; A. Phillips ; R. M. Quimby ; G. Rowell ; W. Rujopakarn ; B. E. Schaefer ; D. A. Smith ; H. F. Swan ; W. T. Vestrand ; J. C. Wheeler ; J. Wren ; F. Yuan ;
Date 16 Jan 2006
Journal Astrophys.J. 638 (2006) L5-L8
AbstractThe 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.
Source arXiv, astro-ph/0601350
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