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The recent discovery of gravitational waves (GWs) from stellar-mass binaryblack holes (BBHs) provided direct evidence of the existence of these systems.BBH lenses would have gravitational microlensing signatures that are distinctfrom single-lens signals. We apply Bayesian statistics to examine thedistinguishability of BBH microlensing events from single-lens events underideal observing conditions, using the photometric capabilities of the KoreanMicrolensing Telescope Network. Given one year of observations, a source starat the Galactic Centre, a GW150914-like BBH lens (total mass 65M$_\odot$, massratio 0.8) at half that distance, and an impact parameter of 0.4 Einsteinradii, we find that binarity is detectable for BBHs with separations down to0.0250 Einstein radii, which is nearly 3.5 times greater than the maximumseparation for which such BBHs would merge within the age of the Universe.Microlensing searches are thus sensitive to more widely separated BBHs than GWsearches, perhaps allowing the discovery of BBH populations produced indifferent channels of binary formation.

Detecting binarity of GW150914-like lenses in gravitational microlensing events