Two candidates radio-quiet millisecond pulsars in Fermi unassociated sources

Multiwavelength observations have been the key to identifying the manyunassociated gammaray sources detected by the FermiLAT telescope. In two ofthe top ten brightest Fermi sources that remain unassociated, opticalobservations of their error ellipses have revealed variable stars eachcoincident with an Xray source detected by Swift. In both cases, a putativebinary orbital period of has been identified from the optical variability,indicating that these are candidate millisecond pulsars (MSPs) that may be thecounterparts to the bright gammaray sources. However, unlike all previousgammaray MSPs detected by Fermi, there is no indication of radio emission fromeither source. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]