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XSS J12270-4859 is an X-ray binary associated with the Fermi LAT gamma-raysource 1FGL J1227.9-4852. In 2012 December, this source underwent a transitionwhere the X-ray and optical luminosity dropped and the spectral signatures ofan accretion disc disappeared. We report the discovery of a 1.69 millisecondpulsar (MSP), PSR J1227-4853, at a dispersion measure of 43.4 pc cm$^{-3}$associated with this source, using the GMRT at 607 MHz. This demonstrates that,post-transition, the system hosts an active radio MSP. This is the third systemafter PSR J1023+0038 and PSR J1824-2452I showing evidence of state switchingbetween radio MSP and low-mass X-ray binary (LMXB) states. We report timingobservations of PSR J1227-4853 with the GMRT and Parkes, which give a precisedetermination of the rotational and orbital parameters of the system. Thecompanion mass measurement of 0.17 to 0.46 M$_{sun}$ suggests that this is aredback system. PSR J1227-4853 is eclipsed for about 40% of its orbit at 607MHz; with additional short-duration eclipses at all orbital phases. We alsofind that the pulsar is very energetic, with a spin-down luminosity of ~10$^{35}$ erg s$^{-1}$. We report simultaneous imaging and timing observationswith the GMRT, which suggests that eclipses are caused by absorption, ratherthan dispersion smearing or scattering.

Discovery of PSR J1227-4853: A transition from a low-mass X-ray binary to a redback millisecond pulsar