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Discovered after the end of the Compton Gamma-Ray Observatory mission, theradio pulsar PSR J2021+3651 was long considered a likely counterpart of thehigh-energy gamma-ray source 2CG 075+00 = 3EG J2021+3716 = GeV J2020+3658, butit could not be confirmed due to the lack of a contemporaneous radio pulsarephemeris to fold the sparse, archival gamma-ray photons. Here, we report thediscovery of gamma-ray pulsations from PSR J2021+3651 in the 100-1500 MeV rangeusing data from the AGILE satellite gathered over 8 months, folded on a denselysampled, contemporaneous radio ephemeris obtained for this purpose at the GreenBank Telescope. The gamma-ray pulse consists of two sharp peaks separated by0.47+/-0.01 cycles. The single radio pulse leads the first gamma-ray peak by0.165+/-0.010 cycles. These properties are similar to those of other gamma-raypulsars, and the phase relationship of the peaks can be interpreted in thecontext of the outer-gap accelerator model for gamma-ray emission. Pulse-phaseresolved images show that there is only one dominant source, AGL J2020.5+3653 =PSR J2021+3651 in the region previously containing confused sources 3EGJ2021+3716 and 3EG J2016+3657.

Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILE