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The 44.7 ms X-ray pulsar in the supernova remnant G12.82-0.02/HESS J1813-178has the second highest spin-down luminosity of known pulsars in the Galaxy,with E-dot=5.6e37 erg/s. Using the Green Bank Telescope, we have detected radiopulsations from PSR J1813-1749 at 4.4-10.2 GHz. The pulse is highly scattered,with an exponential decay timescale \tau longer than that of any other pulsarat these frequencies. A point source detected at this position by Dzib et al.in several observations with the Jansky Very Large Array can be attributed tothe pulsed emission. The steep dependence of \tau on observing frequencyexplains why all previous pulsation searches at lower frequencies failed(\tau~0.25 s at 2 GHz). The large dispersion measure, DM=1087 pc/cc, indicatesa distance of either 6.2 or 12 kpc according to two widely used models of theelectron density distribution in the Galaxy. These disfavor a previouslysuggested association with a young stellar cluster at the closer distance of4.8 kpc. The high X-ray measured column density of ~1e23/cm^2 also supports alarge distance. If at d~12 kpc, HESS J1813-178 would be one of the mostluminous TeV sources in the Galaxy.

Radio Detection of PSR J1813-1749 in HESS J1813-178: The Most Scattered Pulsar Known