GRB 180504A: NOT afterglow candidate

We observed the field of GRB 180504A (Lien et al., GCN 22682) with the Nordic Optical Telescope equipped with the AlFOSC camera. The field has a bad visibility from La Palma, and observations were carried out at large airmass (~2) and straddling twilight. The average seeing was 1.5". Coincident with the UVOT-enhanced position reported by Evans (GCN 22683), we note the presence of a faint source, at a position (J2000; 0.5" error): RA = 22:04:34.61 Dec = -14:39:30.0 We note that the automatically reported un-enhanced XRT position (available from http://www.swift.ac.uk/xrt_positions/) is at the time of writing significantly different from the one quoted in the GCN, and would not include our afterglow candidate. Photometry of the candidate against nearby stars from the Pan-STARRS survey yields r = 22.5 +/- 0.3 (AB) at a mean time 2018 May 5.222 UT (9.57 hr after the trigger) Further observations are planned.