Abstract
The number of known radio pulsars has now increased up to 333. Among them only three have a low timing age tau = P/2P such to be considered young pulsars. These are PSR0531+21 (the Crab pulsar) aged approx. 1000 years, PSR1509-58 aged approx. 1500 years and PSR0833-45 (the Vela pulsar) aged approx. 11000 years. The Crab and Vela pulsars are strong ..gamma..-ray emitters being the most and third most intense sources of ..gamma..-ray emission of the 2CG catalogue. PSR1509-58 is located inside the error box of a ..gamma..-ray source contained in the list published by Wills et al., 1980. ..gamma..-ray emission from older radio pulsars has been indicated several times but never confirmed. In this paper results of a search for pulsed ..gamma..-ray emission from old radio pulsars in the COS-B data in the energy range 50 MeV to 2 GeV are reported. The analysis has been done by using either pulsar parameters obtained in simultaneous radio and ..gamma..-ray observations or parameters which could be reliably derived by interpolation from radio observations spanning the COS-B observations. 16 references, 1 figure, 1 table.
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