We report the discovery of a planet-mass companion to the microlens OGLE-2016-BLG-0263L .
Unlike most low-mass companions that were detected through perturbations to the smooth and symmetric light curves produced by the primary , the companion was discovered through the channel of a repeating event , in which the companion itself produced its own single-mass light curve after the event produced by the primary had ended .
Thanks to the continuous coverage of the second peak by high-cadence surveys , the possibility of the repeating nature due to source binarity is excluded with a 96 \% confidence level .
The mass of the companion estimated by a Bayesian analysis is M _ { p } = 4.1 _ { -2.5 } ^ { +6.5 } M _ { 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 _ { sl } \sim 15.4 corresponds to the region beyond Neptune , the outermost planet of the solar system .
We discuss the importance of high-cadence surveys in expanding the range of microlensing detections of low-mass companions and future space-based microlensing surveys .