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To overcome the high optical extinction, near-infrared observations areneeded for probing the microlensing events toward the Galactic center. The2015-2019 UKIRT microlensing survey toward the Galactic center is the firstdedicated precursor near-infrared (NIR) survey for the Nancy Grace Roman SpaceTelescope. We here analyze the online data from the UKIRT microlensing survey,reaching $l=b=0^\circ$. Using the event-finder algorithm of KMTNet with the$\Delta \chi^2$ threshold of 250, we find 522 clear events, 436 possibleevents, and 27 possible anomalous events. We fit a point-source point-lens(PSPL) model to all the clear events and derive the PSPL parameters withuncertainties using a Markov chain Monte Carlo method. Assuming perfectdetection efficiency, we compute the uncorrected event rates, which shouldserve as the lower limits on the true event rate. We find that the uncorrectedNIR event rates are likely rising toward the Galactic center and higher thanthe optical event rates.

Towards Measuring Microlensing Event Rate in the Galactic Center: I. Events Detection from the UKIRT Microlensing Survey Data