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Kerr, M. L. Jones, M. T. Lam, M. T. Wolff, N. Garver-Daniels, N. Lewandowska, P. A. Gentile, P. B. Demorest, P. R. Brook, P. S. Ray, P. T. Baker, R. D. Ferdman, R. S. Lynch, R. Spiewak, S. Bogdanov, S. Guillot, S. J. Vigeland, S. M. Ransom, S. Price, T. Dolch, T. T. Pennucci, W. W. Zhu, Z. Arzoumanian","submitted_at":"2019-02-19T16:43:37Z","abstract_excerpt":"The Neutron Star Interior Composition Explorer (NICER) is an X-ray astrophysics payload on the International Space Station. It enables unprecedented high-precision timing of millisecond pulsars without the pulse broadening and delays due to dispersion and scattering within the interstellar medium that plague radio timing. We present initial timing results from a year of data on the millisecond pulsars PSR B1937+21 and PSR J0218+4232, and nine months of data on PSR B1821-24. 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