TITLE: GCN CIRCULAR NUMBER: 5703 SUBJECT: GRB 061006: Swift-XRT Team Refined Analysis DATE: 06/10/07 02:24:20 GMT FROM: Eleonora Troja at INAF-IASFPA E. Troja (U. Leicester/INAF-IASFPa), K. L. Page(U. Leicester), D. N. Burrows (PSU) & P. Schady (MSSL-UCL) report on behalf of the Swift-XRT Team: We have analysed the first 4 orbits of Swift-XRT data obtained for GRB 061006 (GCN Circ. 5699; Schady et al.). Our data set consists of 7.8 ks in Photon Counting (PC) mode. We derived a XRT refined position of: RA(J2000) = 07h 24m 06.36s Dec(J2000) = -79d 11' 56.80'' with an estimated error radius of 6 arcsec (90% containment, including boresight uncertainties). This lies 2.3 arcsec from the preliminary XRT position and 45'' arcsec from the on-board calculated BAT position, reported in GCN 5699. The X-ray lightcurve shows an initial slope of 2.26 +/- 0.10, breaking around 290 s after the burst to a flatter decay slope of 0.77 +/- 0.07. The time-averaged spectrum (from T+155 s to T+18.6 ks) can be fit with an absorbed power-law with a photon index of 1.7 +/- 0.4 and an absorption column of 1.8e21 cm^-2, consistent at the 90% confidence level with the Galactic value in the direction of the burst (1.33e21 cm^-2). The mean observed (unabsorbed) flux in the 0.2-10 keV energy band is 1.4e-12 (1.9e-12) erg cm^-2 s^-1. If the afterglow continues decaying at the same rate, the count rate at T+24 h is predicted to be 1.8e-3 cts s^-1, corresponding to an unabsorbed 0.2-10 keV flux of 1.5e-13 erg cm^-2 s^-1. This circular is an official product of the Swift-XRT team.