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The wealth of detections of millisecond pulsars (MSPs) in $\gamma$-rays by{\em Fermi} has spurred searches for these objects among the severalunidentified $\gamma$-ray sources. Interesting targets are a sub-class ofbinary MSPs, dubbed "Black Widows" (BWs) and "Redbacks" (RBs), which are inorbit with low-mass non-degenerate companions fully or partially ablated byirradiation from the MSP wind. These systems can be easily missed in radiopulsar surveys owing to the eclipse of the radio signal by the intra-binaryplasma from the ablated companion star photosphere, making them better targetsfor multi-wavelength observations. We used optical and X-ray data from publicdatabases to carry out a systematic investigation of all the unidentified$\gamma$-ray sources from the Fermi Large Area Telescope (LAT) Third SourceCatalog (3FGL), which have been pre-selected as likely MSP candidates accordingto a machine-learning technique analysis. We tested our procedure by recoveringknown binary BW/RB identifications and searched for new ones, finding possiblecandidates. At the same time, we investigated previously proposed BW/RBidentifications and we ruled out one of them based upon the updated$\gamma$-ray source coordinates.

A Multi-wavelength search for Black Widows and Redbacks counterparts of candidate $\gamma$-ray millisecond pulsars