NICER observation list: Target ID 657201

Famous for their purely thermal emission, X-ray dim isolated neutron stars (XDINS), while still few in numbers, could be as common as radio pulsars and may play an important evolutionary role among the known Galactic isolated neutron star (INS) population. The wide area and depth of the eROSITA All-Sky Survey (eRASS) enables to detect XDINS beyond the solar vicinity. For two candidates, selected from the eRASS, optical follow-up with the Large Binocular Telescope and the South African Large Telescope make a non-INS nature very unlikely. We thus propose follow-up observations with NICER, to probe the candidates' temporal and spectral properties, with the goal to investigate how well the candidates conform to the XDINS population or other classes of INS.