TITLE: GCN CIRCULAR NUMBER: 23030 SUBJECT: GRB 180718A: Swift-XRT observations DATE: 18/07/24 13:37:13 GMT FROM: Boris Sbarufatti at PSU J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), A. Tohuvavohu (PSU), S. J. LaPorte (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Swift/BAT-detected burst GRB 180718A (Svinkin et al. GCN Circ. 22959), collecting 1.5 ks of Photon Counting (PC) mode data between T0+113.7 ks and T0+115.2 ks. No X-ray sources have been detected consistent with being within 296 arcsec of the Swift/BAT position. The 3-sigma upper limit in the field ranges from ~0.005 to ~0.013 ct s^-1, corresponding to a 0.3-10 keV observed flux of 2.1e-13 to 5.1e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum). The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00020802. This circular is an official product of the Swift-XRT team.