Sleuthing A New Eclipsing Accreting Millisecond Pulsar

We have recently discovered a new gammaray loud lowmass Xray binary, 3FGLJ0427.96704. The Xray and radio properties of this source suggest it is atransitional millisecond pulsar in the accreting state. Uniquely among membersof this class, this source shows optical, Xray, and gammaray eclipses,allowing precise constraints not available for noneclipsing systems, such asmeasurements of the binary component masses. Here we propose XMM Xray andoptical observations to better understand the variability in the system anddetermine how similar its properties are to the other transitional millisecondpulsars. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]