Ground-based follow-up light curve of TOI-1797 b on UTC 2021 January 27 from the LCOGT 1 m network in PanSTARRS Y-band. The grey filled circles show the photometry from the individual exposures. The green filled circles show the results in 10 minute bins. The fitted transit centre time is 2459241.875 BJD, and is consistent with the ephemeris extracted from the TESS and CHEOPS data in the work.