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We report the detection of pulsed gamma-ray emission from the fastmillisecond pulsars (MSPs) B1937+21 (also known as J1939+2134) and B1957+20(J1959+2048) using 18 months of survey data recorded by the \emph{Fermi} LargeArea Telescope (LAT) and timing solutions based on radio observations conductedat the Westerbork and Nan\c{c}ay radio telescopes. In addition, we analyzedarchival \emph{RXTE} and \emph{XMM-Newton} X-ray data for the two MSPs,confirming the X-ray emission properties of PSR B1937+21 and finding evidence($\sim 4\sigma$) for pulsed emission from PSR B1957+20 for the first time. Inboth cases the gamma-ray emission profile is characterized by two peaksseparated by half a rotation and are in close alignment with componentsobserved in radio and X-rays. These two pulsars join PSRs J0034-0534 andJ2214+3000 to form an emerging class of gamma-ray MSPs with phase-aligned peaksin different energy bands. The modeling of the radio and gamma-ray emissionprofiles suggests co-located emission regions in the outer magnetosphere.

Pulsed Gamma Rays from the Original Millisecond and Black Widow Pulsars: a case for Caustic Radio Emission?