TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5562 SUBJECT: GRB 060912: Swift XRT Team Refined Analysis DATE: 06/09/12 18:46:12 GMT FROM: Cheryl Pauline Hurkett at Leicester U C. P. Hurkett, K.L. Page and E. Rol (U Leicester) report on behalf of the Swift XRT team: We have analysed the Swift XRT data from the first orbit observation of GRB 060912 (Hurkett et al., GCN 5558), with a total exposure of 1.7 ks seconds. The refined XRT position is: RA(J2000) = 00 21 08.23 Dec(J2000) = +20 58 15.8 This position is 10.9 arcseconds from the BAT position given in GCN 5558 (Hurkett et al. 2006), 2.8 arcseconds from the XRT position and 2.0 arcseconds from the UVOT given in the same GCN. We estimate an uncertainty of 3.6 arcseconds radius (90% containment). The 0.3-10.0 keV Photon Counting (PC) mode starts 135 seconds after the BAT trigger (T0). The count rate is declining with a decay slope of 0.62 (+/-0.12). A preliminary spectral fit to the PC data gives a spectral power law photon index of 2.08 +/- 0.20 in the [0.3-10] keV band, with a free absorption of 0.17 (+/- 0.06)e22 cm^-2 (Galactic absorption at this location is 4.20e20 cm^-2). The average (in the time range 135-1860 seconds from trigger) estimated unabsorbed 0.3-10 keV flux is then about 2.9E-11 erg/cm2/s. The XRT count rate extrapolated to T0+24 hr is estimated to be about 0.025 cps, corresponding to an unabsorbed 0.3-10 keV flux of about 1.73E-12 erg/cm2/s. This Circular is an official product of the Swift XRT Team.