NICER observation list: Target ID 754001

We propose joint NICER and Swift (X-ray + UV) ToO monitoring observations of a future non-jetted stellar tidal disruption event (TDE). Our main goals are 1) to identify and study accretion states, transitions and accompanying corona formation around a supermassive black hole (SMBH) in a TDE. This is motivated by NICER+Swift's recent success in doing so for the TDE AT2018fyk. 2) To measure the precession period of a newly formed accretion disk in soft X-rays to constrain the SMBH spin. This is again motivated by NICER's detection of a 15 d quasi-periodicity in TDE AT2020ocn which constrained the spin parameter to be between 0.05-0.5. Our goals require both X-ray and UV data, monitoring capability and a large soft X-ray effective area making NICER+Swift the ideal combination for this study.