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Millisecond pulsars, old neutron stars spun-up by accreting matter from acompanion star, can reach high rotation rates of hundreds of revolutions persecond. Until now, all such "recycled" rotation-powered pulsars have beendetected by their spin-modulated radio emission. In a computing-intensive blindsearch of gamma-ray data from the Fermi Large Area Telescope (with partialconstraints from optical data), we detected a 2.5-millisecond pulsar, PSRJ1311-3430. This unambiguously explains a formerly unidentified gamma-raysource that had been a decade-long enigma, confirming previous conjectures. Thepulsar is in a circular orbit with an orbital period of only 93 minutes, theshortest of any spin-powered pulsar binary ever found.

Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations