Аннотация:We obtained a spectrum and UBVRI photometry of the star associated with the X-ray source 1RXS J051439.2-021615 that experienced a rapid optical flare on 25 January 2018. We classified the spectrum as K2V-K5V. The H_alpha line was filled with emission. We explain this event as a flare in an active region on the surface of a late-type main sequence star.