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We report the discovery of a planet-mass companion to the microlensOGLE-2016-BLG-0263L. Unlike most low-mass companions that were detected throughperturbations to the smooth and symmetric light curves produced by the primary,the companion was discovered through the channel of a repeating event, in whichthe companion itself produced its own single-mass light curve after the eventproduced by the primary had ended. Thanks to the continuous coverage of thesecond peak by high-cadence surveys, the possibility of the repeating naturedue to source binarity is excluded with a $96\%$ confidence level. The mass ofthe companion estimated by a Bayesian analysis is $M_{\rm p}=4.1_{-2.5}^{+6.5}\M_{\rm J}$. The projected primary-companion separation is $a_\perp =6.5^{+1.3}_{-1.9}$ au. The ratio of the separation to the snow-line distance of$a_\perp/a_{\rm sl}\sim 15.4$ corresponds to the region beyond Neptune, theoutermost planet of the solar system. We discuss the importance of high-cadencesurveys in expanding the range of microlensing detections of low-masscompanions and future space-based microlensing surveys.

OGLE-2016-BLG-0263L\lowercase{b}: Microlensing Detection of a Very Low-mass Binary Companion Through a Repeating Event Channel