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To provide criteria in the selection of target events preferable forplanetary lensing follow-up observations, we investigate the variation of theprobability of detecting planetary signals depending on the observables of thelensing magnification and source brightness. In estimating the probability, weconsider variation of the photometric precision by using a quantity defined asthe ratio of the fractional deviation of the planetary perturbation to thephotometric precision. From this investigation, we find consistent result fromprevious studies that the probability increases with the increase of themagnification. The increase rate is boosted at a certain magnification at whichperturbations caused by central caustic begin to occur. We find this boostoccurs at moderate magnifications of $A\lesssim 20$, implying that probabilitycan be high even for events with moderate magnifications. The probabilityincreases as the source brightness increases. We find that the probability ofevents associated with stars brighter than clump giants is not negligible evenat magnifications as low as $A\sim 5$. In the absence of rare the prime targetof very high-magnification events, we, therefore, recommend to observe eventswith brightest source stars and highest magnifications among the alertedevents. Due to the increase of the source size with the increase of thebrightness, however, the probability rapidly drops off beyond a certainmagnification, causing detections of low mass ratio planets ($q\lesssim10^{-4}$) difficult from the observations of events involved with giant starswith magnifications $A\gtrsim 70$.

Criteria in the Selection of Target Events for Planetary Microlensing Follow-Up Observation