GCN Circular 12716
D. Grupe (PSU) reports on behalf of the Swift-XRT team: We have analyzed 2.3 ks of XRT data for the IPN-detected burst: GRB 111222A (Hurley et al. et al. GCN Circ. 12714), from 92.9 ks to 95.2 ks after the IPN trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the IPN error circle. Using 1964 s of PC mode data and 1 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 179.21977, +69.07116 which is equivalent to: RA (J2000): 11h 56m 52.74s Dec(J2000): +69d 04' 16.2" with an uncertainty of 3.1 arcsec (radius, 90% confidence). This position is 322 arcsec from the IPN position. We cannot determine at the present time whether the source is fading. A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.5 (+4.9, -4.3). The best-fitting absorption column is consistent with the Galactic value of 1.7 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 6.8 x 10^-11 (7.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 0 (+2.1, -0) x 10^22 cm^-2 Galactic foreground: 1.7 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.5 (+4.9, -4.3) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020194. This circular is an official product of the Swift-XRT team.