GCN Circular 16146
D.N. Burrows (PSU), J.A. Kennea (PSU), S. Campana (INAF-OAB), G. Cusumano (INAF-IASF PA), 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 140423A at 09:20:56.7 UT, 2943.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 197.28927, 49.84233 which is equivalent to: RA(J2000) = 13h 09m 09.42s Dec(J2000) = +49d 50' 32.4" with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 98 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 (1.09 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.4 (+2.57/-1.42) x 10^21 cm^-2 (90% confidence).