GRO/OSSE Observations of Millisecond Pulsars

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The Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory provides high time resolution data in the soft gamma-ray energy range (50 keV -- 10 MeV). We have undertaken a program to search for pulsed gamma-ray emission from known radio pulsars, including the millisecond pulsars, by summed-epoch analysis at the radio periods. We present upper limits on the pulsed and phase-averaged emission from the isolated pulsar PSR 1937+21 and the binary pulsar PSR 1957+20. A large flux of MeV gamma rays from the latter pulsar is presumed to be responsible for the evaporation of its companion (e.g., Kluzniak et al., (1988), Nature, 334, 225). In light of this model, we present an upper limit on the MeV emission of PSR 1957+20 as a function of binary phase. Finally, we summarize recent OSSE observations of other radio pulsars.

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