TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4481 SUBJECT: GRB060111 : XRT refined analysis DATE: 06/01/11 13:23:02 GMT FROM: Michael Goad at U Leicester M.R. Goad, A.P. Beardmore, K. Page (U. Leicester), D. Burrows (PSU), R. Fink (GSFC), M. Ajello (MPE) report on behalf of the Swift XRT team. From analysis of 2.5 ks of Photon Counting mode data of GRB060111 (Zane et al., GCN 4479) starting in the 2nd orbit of observations, we obtain a refined XRT position of RA: 18h 24m 49.0s, Dec:+37d 36m 16.1s (J2000) with an uncertainty of 3.6 arcsec (90% containment). This includes the latest XRT boresight correction. This refined position is 25.1 arcsec from the BAT on-board position and 5 arcsec from the XRT on-board position quoted in GCN 4479. We have also analysed 400 s of XRT Windowed Timing mode observations starting 78 s after the BAT trigger. The XRT lightcurve displays 3 large flares with a peak count rate of approximately 150 ct/s occurring 280 s after the BAT trigger. The light-curve has an underlying powerlaw decay of slope -1.3. The XRT WT mode 0.3-10 keV spectrum is well represented by an absorbed powerlaw with photon index 2.35 +/-0.04 with a mean unabsorbed flux of 2.5e-9 ergs/cm2/s. We find evidence for excess NH of 2.4e21 cm^-2. The predicted 0.3-10 keV unabsorbed flux 24 hours after the BAT trigger is 1.2e-13 ergs/cm2/s