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We present two millisecond pulsar discoveries from the PALFA survey of theGalactic plane with the Arecibo telescope. PSR J1955+2527 is an isolated pulsarwith a period of 4.87 ms, and PSR J1949+3106 has a period of 13.14 ms and is ina 1.9-day binary system with a massive companion. Their timing solutions, basedon 4 years of timing measurements with the Arecibo, Green Bank, Nan\c{c}ay andJodrell Bank telescopes, allow precise determination of spin and astrometricparameters, including precise determinations of their proper motions. For PSRJ1949+3106, we can clearly detect the Shapiro delay. From this we measure thepulsar mass to be 1.47(+0.43/-0.31) solar masses, the companion mass to be0.85(+0.14/-0.11) solar masses and the orbital inclination to be i =79.9(+1.6/-1.9) degrees, where uncertainties correspond to +/- 1-\sigma\confidence levels. With continued timing, we expect to also be able to detectthe advance of periastron for the J1949+3106 system. This effect, combined withthe Shapiro delay, will eventually provide very precise mass measurements forthis system and a test of general relativity.

Two Millisecond Pulsars Discovered by the PALFA Survey and a Shapiro Delay Measurement