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Two new X-ray timing observations of the 44.7 ms pulsar in G12.82-0.02/HESSJ1813-178 were obtained with Chandra and XMM-Newton to determine its precisespin-down rate. With a period derivative of dP/dt = 1.265E-13, PSR J1813-1749is the third most energetic pulsar in the Galaxy, having spin-down luminositydE/dt = 5.6E37 erg/s. Lack of pulsed detection in a deep radio search from theGreen Bank Telescope, and in gamma-rays from Fermi, are reported. We reconsiderthe distance to PSR J1813-1749/G12.82-0.02 in view of its large X-ray measuredcolumn density, N(H) = 10.E22 cm^-2, which exceeds the visual extinction A(V) =9.1 to a young stellar cluster at d = 4.8 kpc that has been associated with it.Although the distance may well be larger, existing data do not constrain itfurther. The small radiative output of PSR J1813-1749/G12.82-0.02 in all bandswould not exceed its spin-down power at any distance in the Galactic disk.

Spin-Down Measurement of PSR J1813-1749: The Energetic Pulsar Powering HESS J1813-178