Confirming 3FGL J1544.6-1125 as an Accreting Millisecond Pulsar

We have recently identified the highenergy gammaray source 3FGL J1544.61125as a candidate transitional millisecond pulsar binary in an accreting state. Werequest a deep exposure with XMMNewton to: i) study the peculiar Xray andoptical variability patterns in more detail, ii) identify optical modulation atthe orbital period and iii) search for coherent accretionpowered millisecondXray pulsations. Only XMMNewton has the required capabilities to carry outthis study, which would improve our understanding of the accretion physics oftransitional millisecond pulsars and, by extension, magnetized objects, ingeneral. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]