GCN Circular 24334
N. R. Tanvir (U. Leicester), C. Gonzalez-Fernandez (IoA, U. Cambridge), A. J. Levan (Radbound U.), D. B. Malesani (DAWN/NBI and DARK/NBI), P. A. Evans (U. Leicester) report on behalf of the VINROUGE collaboration: The location of the variable source reported in Swift/UVOT observations (Breeveld et al., GCN 24296) appears in a field imaged by the 4m VISTA telescope as part of our follow-up of the binary neutron star merger S190425z (LVC collaboration, GCN 24168). The observations were obtained on 2019-04-28 07:55 UT in the 2.15 um Ks-filter. We find no significant flux at the transient location, corresponding to a 2-sigma limiting magnitude of K(AB)~20.6. The absence of a detection in these observations suggests that either it has rapidly faded and/or is not very red in UV-nIR colours. The faint constant source, close to the UVOT position, noted by Palmese et al. (GCN 24312), is marginally visible in our imaging, at about the 2-sigma level.