TITLE: GCN CIRCULAR NUMBER: 32006 SUBJECT: GRB 220506A: Swift-XRT afterglow detection DATE: 22/05/07 09:10:00 GMT FROM: Phil Evans at U of Leicester J.P. Osborne (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 220506A (Urabe et al. GCN Circ. 32001) in a series of observations tiled on the sky. The total exposure time is 1.2 ks, distributed over 6 tiles; the maximum exposure at a single sky location was 463 s. The data were collected between T0+38.2 ks and T0+55.6 ks, and are entirely in Photon Counting (PC) mode. An uncatalogued X-ray source is detected and is above the RASS 3-sigma upper limit at this position, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=239.7257, -26.4186 which is equivalent to: RA (J2000): 15:58:54.18 Dec(J2000): -26:25:06.9 with an uncertainty of 7.2 arcsec (radius, 90% confidence). This position is 15.0 arcmin from the MAXI position. We cannot determine at the present time whether the source is fading. The results of the XRT-team automatic analysis of the likely afterglow are at https://www.swift.ac.uk/xrt_products/TILED_GRB00105/Source1.php. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00105. This circular is an official product of the Swift-XRT team.