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Radio pulsar PSR J1028-5819 was recently discovered in a high-frequencysearch (at 3.1 GHz)in the error circle of the EGRET source 3EG J1027-5817. Thespin-down power of this young pulsar is great enough to make it very likely thecounterpart for the EGRET source. We report here the discovery of gamma-raypulsations from PSR J1028-5819 in early observations by the Large AreaTelescope (LAT) on the Fermi Gamma-Ray Space Telescope. The gamma-ray lightcurve shows two sharp peaks having phase separation of 0.460 +- 0.004, trailingthe very narrow radio pulse by 0.200 +- 0.003 in phase, very similar to that ofother known $\gamma$-ray pulsars. The measured gamma-ray flux gives anefficiency for the pulsar of 10-20% (for outer magnetosphere beam models). Noevidence of a surrounding pulsar wind nebula is seen in the current Fermi databut limits on associated emission are weak because the source lies in a crowdedregion with high background emission. However, the improved angular resolutionafforded by the LAT enables the disentanglement of the previous COS-B and EGRETsource detections into at least two distinct sources, one of which is nowidentified as PSR J1028-5819.

Discovery of Pulsed Gamma Rays from the Young Radio Pulsar PSR J1028-5819 with the Fermi Large Area Telescope