TITLE: GCN CIRCULAR NUMBER: 16313 SUBJECT: GRB 140516A: further Swift-XRT analysis DATE: 14/05/21 23:42:20 GMT FROM: Paolo D'Avanzo at INAF-OAB M. G. Bernardini, P. D'Avanzo, A. Melandri, S. Campana (INAF-OAB), P. A. Evans, K. L. Page (U. Leicester), E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift-XRT team: We have analysed 24.4 ks of XRT data for GRB 140516A (Bernardini et al. GCN Circ. 16285), from 92 s to 397.8 ks after the BAT trigger, in Photon Counting (PC) mode. The X-ray counterpart reported by Bernardini et al. (GCN Circ. 16285) and Gompertz et al. (GCN Circ. 16291) apparently disappeared in the data collected from t-t0=92.8 ks onwards. However, in the same dataset we find evidence for the presence of an unrelated source at the position RA, Dec = 252.99269, +39.95659 which is equivalent to: RA (J2000): 16h 51m 58.25s Dec (J2000): +39d 57' 23.7" with an uncertainty of 4.0 arcsec (radius, 90% confidence). This position is 24" away from the enhanced position for this burst reported by Osborne et al. (GCN Circ. 16289) while it is consistent with the source 165158.53+395728.9 reported in the Krawczyk et al. (2013; ApJS, 206, 4) QSO catalogue. We therefore caution that this field source is likely contaminating the automated late-time X-ray light curve of GRB 140516A, given the spatial proximity to its transient X-ray counterpart. [GCN OPS NOTE(22may14): Per author's request, the word "automated" was added to the last sentence.]