Extended Data Fig. 1: Gaia19bld’s light curve near the magnification peak and PIONIER observations.
From: Microlensing mass measurement from images of rotating gravitational arcs
The black curve is the best-fit light curve to Gaia19bld’s photometric data (blue points with 1σ error bars), shown around the date of maximum brightness. The vertical arrows mark the dates of the Target of Opportunity trigger and of the three PIONIER epochs (12 July, 19 July and 21 July 2019). The photometric data and the light curve are in I-band magnitudes (left vertical axis), while PIONIER data are in H-band magnitudes (right vertical axis), obtained after correcting for differential extinction. The dashed horizontal line is the limiting PIONIER H-band magnitude for median atmospheric conditions.
