The FAST discovery of an Eclipsing Binary Millisecond Pulsar in the
  Globular Cluster M92 (NGC 6341)
  We report the discovery of an eclipsing binary millisecond pulsar in the
globular cluster M92 (NGC6341) with the Five-hundred-meter Aperture Spherical
radio Telescope (FAST). PSR J1717+4308A, or M92A, has a pulse frequency of
316.5~Hz (3.16~ms) and a dispersion measure of 35.45 pc cm$^{-3}$. The pulsar
is a member of a binary system with an orbital period of 0.20~days around a
low-mass companion which has a median mass of $\sim$0.18~\Ms. From observations
so far, at least two eclipsing events have been observed in each orbit. The
longer one lasted for ~5000~s in the orbital phase range 0.1--0.5. The other
lasted for ~500~s and occurred between 1000--2000~s before or after the longer
eclipsing event. The lengths of these two eclipsing events also change. These
properties suggest that J1717+4308A is a ``red-back'' system with a low-mass
main sequence or sub-giant companion. Timing observations of the pulsar and
further searches of the data for additional pulsars are ongoing.
