GCN Circular 25476
E. Ambrosi (INAF-IASFPA), A. DAi (INAF-IASFPA) and V. D Elia (ASDC) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 190823A (Iwakiri et al. GCN circ. 25456) in a series of observations tiled on the sky. Total exposure time is 1.8 ks, distributed over 7 tiles. The data were collected between T0+12.1 ks and T0+18 ks. One uncatalogued X-ray source has been detected, with the following details: RA (J2000.0): 279.68736d = 18:38:44.97 Dec (J2000.0): -43.52789d = -43:31:40.4 Error: 8.6 arcsec (radius, 90% conf.) Count-rate: 4.1 (+1.7, -1.3) ��10^-2 ct s^ -1 Distance: 18.6 arcmin from MAXI position The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00085/ . This circular is an official product of the Swift-XRT team.