NICER observation list: Target ID 751709

Over the past decade, three millisecond pulsar binaries have been observed to switch between accreting and rotation-powered pulsar states, thereby unambiguously establishing the long suspected link between low-mass X-ray binaries and 'recycled' pulsars. In the low-luminosity accreting state, they exhibit X-ray and optical variability unlike anything observed in other X-ray binaries. We propose a Target of Opportunity program to trigger a NICER observing campaign on the next nearby binary recycled pulsar transformation to an accretion disk dominated state. This will result in an improved understanding of the peculiar phenomenology of these systems, which, in turn, may shed light on the little-understood physics of the quiescent regime in NS X-ray binaries.