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PSR J1819-1458 is a rotating radio transient (RRAT) source with an inferredsurface dipole magnetic field strength of 5e13 G and a 4.26-s spin period. Wepresent XMM-Newton observations of the X-ray counterpart of this source, CXOUJ181939.1-145804, in which we identify pulsations and a possible spectralfeature. The X-ray pulsations are at the period predicted by the radioephemeris, providing an unambiguous identification with the radio source andconfirmation of its neutron star nature. The X-ray pulse has a 0.3-5 keV pulsedfraction of 34% and is aligned with the expected phase of the radio pulse. TheX-ray spectrum is fit well by an absorbed blackbody with kT = 0.14 keV with theaddition of an absorption feature at 1 keV, with total absorbed flux of 1.5e-13ergs/cm^2/s (0.3-5 keV). This absorption feature is well modeled by a Gaussianor resonant cyclotron scattering model, but its significance is dependent onthe choice of continuum model. We find no evidence for any X-ray bursts oraperiodic variability on timescales of 6 ms to the duration of the observationand can place the most stringent limit to date of < 3e-9 ergs/cm^2/s on theabsorbed 0.3-5 keV flux of any bursts.

Discovery of Pulsations and a Possible Spectral Feature in the X-ray Emission from Rotating Radio Transient J1819-1458