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We have created 0.3--10 keV, 13 year, unabsorbed luminosity lightcurves for528 X-ray sources in the central 20' of M31. We have 174 Chandra observationsspaced at ~1 month intervals thanks to our transient monitoring program, deeperobservations of the M31 nucleus, and some public data from other surveys. Wecreated 0.5--4.5 keV structure functions (SFs) for each source, for comparisonwith the ensemble structure function of AGN. We find 220 X-ray sources withluminosities > ~1E+35 erg/s that have SFs with significantly more variabilitythan the ensemble AGN SF, and are likely X-ray binaries (XBs). A further 30X-ray sources were identified as XBs using other methods. We therefore have 250probable XBs in total, including ~200 new identifications. This resultrepresents great progress over the ~50 XBs and ~40 XB candidates previouslyidentified out of the ~2000 X-ray sources within the D_25 region of M31; italso demonstrates the power of SF analysis for identifying XBs in externalgalaxies. We also identify a new transient black hole candidate, associatedwith the M31 globular cluster B128.

Around 200 new X-ray binary IDs from 13 years of Chandra observations of the M31 center