TITLE: GCN CIRCULAR NUMBER: 30082 SUBJECT: GRB 210527A: Swift-XRT observations DATE: 21/05/27 08:40:43 GMT FROM: Phil Evans at U of Leicester J.P. Osborne (U. Leicester), D.N. Burrows (PSU), J.A. Kennea (PSU), G. Tagliaferri (INAF-OAB), S. Campana (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 210527A at 08:00:28.4 UT, 3159.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 172.32169, 31.62421 which is equivalent to: RA(J2000) = 11h 29m 17.21s Dec(J2000) = +31d 37' 27.2" with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 104 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 https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.85 x 10^20 cm^-2 (Willingale et al. 2013).