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Kaplan, Duncan Lorimer, Ingrid Stairs, Jason Hessels, Kevin Stovall, Maura McLaughlin, Peter Gentile, Ren\\'ee Spiewak, Ryan Lynch, Scott Ransom","submitted_at":"2016-02-01T20:05:55Z","abstract_excerpt":"We present the first X-ray observations of three recently discovered millisecond pulsars (MSPs) with interesting characteristics: PSR J0337+1715, PSR J0636+5129, and PSR J0645+5158. PSR J0337+1715 is a fast-spinning, bright, and so-far unique MSP in a hierarchical triple system with two white dwarf (WD) companions. PSR J0636+5129 is a MSP in a very tight 96-min orbit with a low-mass, 8 $M_J$ companion. PSR J0645+5158 is a nearby, isolated MSP with a very small duty cycle (1-2%), which has led to its inclusion in high-precision pulsar timing programs. 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