Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-04
Mon.Not.Roy.Astron.Soc.370:1859-1866,2006
Astronomy and Astrophysics
Astrophysics
13 pages, 5 figures. Accepted for publication by MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10609.x
We present the results of X-ray and optical observations of GRB050712 performed by Swift. The X-ray lightcurve of this burst exhibits episodes of flares in the first 1000s, the same epoch at which the UVOT detected an optical counterpart. A shallow X-ray decay, with a decay slope of -0.73, followed and lasted ~70ks. This behaviour can be explained in terms of activity of GRB 'inner engine', with the possibility of that the last flare is caused by the interaction of the ejecta with the surrounding medium. We also find interesting spectral parameters for the X-ray emission. In particular, data suggest the presence of an intrinsic absorption in the first 1000s, which can be explained if circumbust medium clouds lie along the line of sight.
H. A. Krimm.
Breeveld Alice A.
Burrows David N.
de Pasquale Massimiliano
Gehrels Neil
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