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We report on a NuSTAR observation of the young, energetic pulsar PSRJ1617-5055. Parkes Observatory 3 GHz radio observations of the pulsar (takenabout 7 years before the NuSTAR observations) are also reported here. NuSTARdetected pulsations at a frequency of $f\approx14.4$ Hz ($P\approx69.44$ ms)and, in addition, the observation was long enough to measure the source'sfrequency derivative, $\dot{f}\approx-2.8\times10^{-11}$ Hz s$^{-1}$. We findthat the pulsar shows one peak per period at both hard X-ray and radiowavelengths, but that the hard X-ray pulse is broader (having a duty cycle of$\sim 0.7$), than the radio pulse (having a duty cycle of $\sim 0.08$).Additionally, the radio pulse is strongly linearly polarized. J1617'sphase-integrated hard X-ray spectrum is well fit by an absorbed power-lawmodel, with a photon index $\Gamma=1.59\pm 0.02$. The hard X-ray pulsations arewell described by three Fourier harmonics, and have a pulsed fraction thatincreases with energy. We also fit the phase-resolved NuSTAR spectra with anabsorbed power-law model in five phase bins and find that the photon indexvaries with phase from $\Gamma = 1.52\pm 0.03$ at phases around the fluxmaximum to $\Gamma=1.79\pm 0.06$ around the flux minimum. Lastly, we compareour results with other pulsars whose magnetospheric emission is detected athard X-ray energies and find that, similar to previous studies, J1617's hardX-ray properties are more similar to the MeV pulsars than the GeV pulsars.

Precise timing and phase-resolved spectroscopy of the young pulsar J1617-5055 with NuSTAR