r-band light curves of 22 lensed QSOs

Each lensed quasar was typically monitored for one to four seasons, often shared between the two telescopes to mitigate the interruptions forced by the COVID-19 pandemic. The sample of targets consists of 19 quadruply and 3 doubly imaged quasars, which received a total of 1918 hours on-sky time split in 21581 wide-field frames, each of 320 seconds.

In a given field, the 5-{sigma} depth of the combined exposures typically reaches the 27th magnitude, while that of single visits is 24.5mag - similar to the expected depth of the upcoming Vera-Rubin LSST. The fluxes of the different lensed images of the targets were reliably de-blended, providing not only light curves with photometric precision down to the photon noise limit, but also high resolution models of the targets whose features and astrometry were systematically confirmed in Hubble Space Telescope imaging.