TITLE: GCN CIRCULAR NUMBER: 14820 SUBJECT: GRB 130606B: Swift-XRT observations DATE: 13/06/08 00:26:50 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. A. Kennea (PSU) reports on behalf of the Swift-XRT team: We have analysed 3.1 ks of XRT data for the Fermi/LAT-detected burst: GRB 130606B, from 106.6 ks to 114.1 ks after the Fermi/LAT trigger. The data are entirely in Photon Counting (PC) mode. An X-ray source is detected within the Fermi/LAT error circle. Using 2899 s of PC mode data and 4 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 = 218.52931, -22.10229 which is equivalent to: RA (J2000): 14h 34m 07.04s Dec(J2000): -22d 06' 08.2" with an uncertainty of 1.8 arcsec (radius, 90% confidence). This position is 181 arcsec from the Fermi/LAT position. the light curve is consistent with a constant source of mean count rate 8.0e-02 ct/sec. A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.3 (+/-0.4). The best-fitting absorption column is 2.0 (+1.0, -0.9) x 10^21 cm^-2, in excess of the Galactic value of 6.7 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 3.3 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.0 (+1.0, -0.9) x 10^21 cm^-2 Galactic foreground: 6.7 x 10^20 cm^-2 Excess significance: 2.5 sigma Photon index: 2.3 (+/-0.4) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020283. This circular is an official product of the Swift-XRT team.