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In a radio search with the Green Bank Telescope of three unidentified lowGalactic latitude Fermi-LAT sources, we have discovered the middle-aged pulsarJ2030+3641, associated with 1FGL J2030.0+3641 (2FGL J2030.0+3640). Followingthe detection of gamma-ray pulsations using a radio ephemeris, we have obtaineda phase-coherent timing solution based on gamma-ray and radio pulse arrivaltimes that spans the entire Fermi mission. With a rotation period of 0.2 s,spin-down luminosity of 3e34 erg/s, and characteristic age of 0.5 Myr, PSRJ2030+3641 is a middle-aged neutron star with spin parameters similar to thoseof the exceedingly gamma-ray-bright and radio-undetected Geminga. Its gamma-rayflux is 1% that of Geminga, primarily because of its much larger distance, assuggested by the large integrated column density of free electrons, DM=246pc/cc. We fit the gamma-ray light curve, along with limited radio polarimetricconstraints, to four geometrical models of magnetospheric emission, and whilenone of the fits have high significance some are encouraging and suggest thatfurther refinements of these models may be worthwhile. We argue that not manymore non-millisecond radio pulsars may be detected along the Galactic planethat are responsible for LAT sources, but that modified methods to search forgamma-ray pulsations should be productive -- PSR J2030+3641 would have beenfound blindly in gamma rays if only >0.8 GeV photons had been considered, owingto its relatively flat spectrum and location in a region of high softbackground.

PSR J2030+3641: radio discovery and gamma-ray study of a middle-aged pulsar in the now identified Fermi-LAT source 1FGL J2030.0+3641