090273

PSR J1627+3219 is a millisecond pulsar (MSP) recently discovered by the Five hundred meter Aperture Spherical radio Telescope (FAST). Subsequent analysis of the corresponding Fermi-LAT source resulted in the detection of strong gamma-ray pulsations. Follow-up timing observations reveal that PSR J1627+3219 is in a black-widow binary system with high spin-down power and exhibits transitional behaviors. We propose a 30 ks XMM observation covering two full orbits of the binary system in order to detect the X-ray counterpart and possible orbital variability/modulation in the X-ray emission from this unique pulsar. [truncated! Please see actual data for full text]