GCN Circular 33465
D.N. Burrows (PSU), J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), A. D'Ai (INAF-IASFPA), S. Dichiara (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has conducted further observations of the field of the Fermi/GBM-detected burst GRB 230307A (Dalessi et al. GCN Circ. 33407). The observations now extend from T0+83.6 ks to T0+437.2 ks. Of the sources reported by Burrows et al. (GCN Circ. 33429), "Source 2" is fading with >3-sigma significance, and is therefore likely the GRB afterglow. Using 1252 s of PC mode data and 1 UVOT image, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 60.85935, -75.37884 which is equivalent to: RA (J2000): 04h 03m 26.24s Dec(J2000): -75d 22' 43.8" with an uncertainty of 3.2 arcsec (radius, 90% confidence). This position is 13.3 arcsec from the IPN improved position (Kozyrev et al. GCN Circ. 33461). The light curve can be modelled with a power-law decay with a decay index of alpha=1.1 (+0.6, -0.5). The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021537. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00110. This circular is an official product of the Swift-XRT team.