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We present new timing and spectral analyses of PSR J1412+7922 (Calvera) andPSR J1849-0001, which are only seen as pulsars in X-rays, based on observationsconducted with the Neutron Star Interior Composition Explorer (NICER). Weobtain updated and substantially improved pulse ephemerides compared toprevious X-ray studies, as well as spectra that can be well-fit by simpleblackbodies and/or a power law. Our refined timing measurements enable deepersearches for pulsations at other wavelengths and sensitive targeted searches byLIGO/Virgo for continuous gravitational waves from these neutron stars. Usingthe sensitivity of LIGO's first observing run, we estimate constraints that agravitational wave search of these pulsars would obtain on the size of theirmass deformation and r-mode fluid oscillation.

Neutron Star Interior Composition Explorer X-ray Timing of the Radio and Gamma-ray Quiet Pulsars PSR J1412+7922 AND PSR J1849-0001