TITLE: GCN CIRCULAR NUMBER: 31924 SUBJECT: GRB 220403C: Further Swift-XRT observations DATE: 22/04/20 08:07:27 GMT FROM: Phil Evans at U of Leicester A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed a second follow-up observation of GRB 220403C, detected outside the BAT coded FOV by GUANO NITRATES (Aaron Tohuvavohu et al. GCN Circ. 31824), and later triangulated by IPN (GCN Circ. 31877). This time the XRT pointed at the centre of the IPN error region, collecting 2.5 ks of Photon Counting (PC) mode data between T0+1311.3 ks and T0+1324.1 ks. Two uncatalogued X-ray sources have been detected, however neither of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if either, is the afterglow. Details of these sources are given below: Source 1: RA (J2000.0): 17.5547 = 01:10:13.12 Dec (J2000.0): -56.2345 = -56:14:04.2 Error: 5.5 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: (5.7 [+2.0, -1.6])e-3 ct s^-1 Distance: 46 arcsec from IPN position. Flux: (6.8 [+2.4, -2.0])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 2: RA (J2000.0): 17.9074 = 01:11:37.77 Dec (J2000.0): -56.1775 = -56:10:38.9 Error: 9.7 arcsec (radius, 90% conf.) Count-rate: (5.0 [+3.2, -2.3])e-3 ct s^-1 Distance: 695 arcsec from IPN position. We note that neither of these sources is consistent with the location of the galaxy LEDA 3080270 which lies within the IPN error box. 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/00021485. This circular is an official product of the Swift-XRT team.