NICER observation list: Target ID 466201

ESO 253-G003/ASASSN-14ko is a highly unique AGN that undergoes periodic flares every ~114 days with a negative, non-zero period derivative. There were 17 outbursts detected in V-/g-band ASAS-SN survey data during the last six years, with missing outbursts due only to seasonal gaps. Numerous flaring events are highly unusual for an AGN, which normally vary at a low-level following a damped random walk model. The precise origin of these flares remains unknown but this could be the first example of a repeating partial tidal disruption event (TDE). We propose to obtain NICER observations of three upcoming outbursts, which will be complemented by UV/optical monitoring, in order to fully characterize the X-ray evolution during the flares and compare the emission between flares over time.