TITLE: GCN CIRCULAR NUMBER: 25942 SUBJECT: GRB 191001A: Swift-XRT observations DATE: 19/10/03 20:26:43 GMT FROM: Antonino D'Ai at IASF-PA D.N. Burrows (PSU), J. D. Gropp (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/GBM detected burst GRB 191001A (GCN Circ. 25893, 25894), collecting 5.2 ks of Photon Counting (PC) mode data between T0+114.2 ks and T0+161.3 ks. No X-ray sources have been detected consistent with being within 2.0 arcsec of the likely associated optical transient AT2019rog (GCN Circ. 25911, 25918, 25919 and Tonry et al., TNSTR 1954). The 3-sigma upper limit in the field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 8.6e-14 to 1.0e-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 https://www.swift.ac.uk/ToO_GRBs/00020949. This circular is an official product of the Swift-XRT team.