TITLE: GCN CIRCULAR NUMBER: 14733 SUBJECT: GRB 130603A: Swift-XRT observations DATE: 13/06/03 07:56:30 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), J.A. Kennea (PSU), M. Perri (ASDC), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester) and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 130603A at 06:51:16.2 UT, 3103.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 86.89380, 82.90992 which is equivalent to: RA(J2000) = 05h 47m 34.51s Dec(J2000) = +82d 54' 35.7" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 90 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (5.28 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 4.9 (+2.95/-2.45) x 10^21 cm^-2 (90% confidence).