  Recent observations of repeating fast radio bursts (FRBs) suggest that some
FRBs reside in an environment consistent with that of binary neutron star (BNS)
mergers. The bursting rate for repeaters could be very high and the emission
site is likely from a magnetosphere. We discuss a hypothesis of producing
abundant repeating FRBs in BNS systems. Decades to centuries before a BNS
system coalesces, the magnetospheres of the two neutron stars start to interact
relentlessly. Abrupt magnetic reconnection accelerates particles, which emit
coherent radio waves in bunches via curvature radiation. FRBs are detected as
these bright radiation beams point towards Earth. This model predicts
quasi-periodicity of the bursts at the rotation periods of the two merging
neutron stars (tens of milliseconds and seconds, respectively) as well as the
period of orbital motion (of the order of 100 s). The bursting activities are
expected to elevate with time as the two neutron stars get closer. The
repeating FRB sources should be gravitational wave (GW) sources for space-borne
detectors such as LISA if the sources are close enough, and will be eventually
detected by ground-based detectors when the two neutron stars coalesce.

High Energy Astrophysical Phenomena