NICER observation list: Target ID 462201

The target of oppportunity targets of this proposal are a new X-ray luminous nova in outburst, and a flaring nova-like binary in the Large Magellanic Cloud, RX J0513.9-6951. Both host nuclear burning white dwarfs and will be observed as luminous supersoft X-ray sources. The main aim is to measure pulsations with time scales of tens of seconds, already detected in other such sources. These observations allow linking the periodicities with other physical parameters, in order to search for their root cause. High S/N data obtained with NICER, over intervals of tens of minutes within one or few days, are optimal for this analysis, and will give insight on the mechanism of this intriguing quasi-periodic variability.