The anomalous early afterglow of GRB 050801
Rykoff, E. S. and Mangano, V. and Yost , S. A. and Sarı, R. and Aharonian, F. and Akerlof, C. W. and Ashley, M. C. B. and Barthelmy, S. D. and Burrows, D. N. and Gehrels, N. and Göğüş, Ersin and Güver, T. and Horns, D. and Kızıloğlu, Ü. and Krimm, H. A. and McKay, T. A. and Özel, M. and Phillips , A. and Quimby, R. M. and Rowell, G. and Rujopakarn, W. and Schaefer, B. E. and Smith, D. A. and Swan, H. F. and Vestrand, W. T. and Wheeler, J. C. and Wren, J. and Yuan, F. (2006) The anomalous early afterglow of GRB 050801. The Astrophysical journal, 638 (1). L5-L8. ISSN 0004-637X
Official URL: http://dx.doi.org/10.1086/501007
The ROTSE-IIIc telescope at the HESS 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 light curve does not fade or brighten significantly over the first similar to 250 s, after which there is an achromatic break and the light curve declines in typical power-law fashion. The Swift XRT also obtained early observations starting at 69 s after the burst onset. The X-ray light curve shows the same features as the optical light curve. 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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