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Fig. 1

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Upper panel: tracks of the light centroid for a single source event (dotted green line) and a microlensing event with the same single source parameters (dashed black line). The blue circles correspond to Gaia along-scan measurements at different tobs, denoted by the coloured circles. Middle panel: Gaia along-scan measurements, xobs, as a function of tobs for the microlensing event. Lower panel: residuals between the simulated data with microlensing vs the model with no microlensing (Δxobs) as a function of tobs. The vertical dashed green lines correspond to t0. For all the panels, we assume the following parameters: α0 = 6.5°, δ0 = −47.3°, μα* = −2.8 mas/yr, μδ = −5.5 mas/yr, ϖ = 1 mas, u0 = −0.6, θE = 5 mas, tE = 100 days, t0 = 2017.8, πEE = −0.1, πEN = −0.1, and G0 = 14.

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