Roberto K. SaitoDante MinnitiValentin D. IvanovMASETTI, NICOLANICOLAMASETTIMaria Gabriela NavarroRoberto Cid FernandesDaniel Ruschel-DutraLeigh C. SmithPhilip W. LucasCarlos Gonzalez-FernandezRodrigo Contreras Ramos2020-11-272020-11-2720190035-8711http://hdl.handle.net/20.500.12386/28583We report the discovery of VVV-WIT-04, a near-infrared variable source towards the Galactic disk located ~0.2 arcsec apart from the position of the radio source PMN J1515-5559. The object was found serendipitously in the near-IR data of the ESO public survey VISTA Variables in the V\'ia L\'actea (VVV). Our analysis is based on variability, multicolor, and proper motion data from VVV and VVV eXtended surveys, complemented with archive data at longer wavelengths. We suggest that VVV-WIT-04 has an extragalactic origin as the near-IR counterpart of PMN J1515-5559. The Ks-band light-curve of VVV-WIT-04 is highly variable and consistent with that of an Optically Violent Variable (OVV) quasar. The variability in the near-IR can be interpreted as the redshifted optical variability. Residuals to the proper motion varies with the magnitude suggesting contamination by a blended source. Alternative scenarios, including a transient event such as a nova or supernova, or even a binary microlensing event are not in agreement with the available data.STAMPAenArticle10.1093/mnras/stz26312-s2.0-85075234215000496922300084https://academic.oup.com/mnras/article/490/1/1171/5572280FIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos