TITLE: GCN CIRCULAR NUMBER: 22991 SUBJECT: GRB 180720C: LT observations DATE: 18/07/21 08:22:42 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi, R. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU) on behalf of a large collaboration report: The 2-m robotic Liverpool Telescope automatically began observing Swift GRB 180720C (LaPorte et al. GCN 22982) on July 20, 22:28:18 UT (261 seconds after the GRB trigger time) with the RINGO3 polarimeter and the IO:O camera in the SDSS-R filter. Within the enhanced Swift-XRT error circle (Evans et al. GCN 22987) we do not find any uncatalogued object down to r'>20.4 mag at a mid time of 47 minutes post GRB with a 3x10s exposure, as calibrated against nearby Pan-STARRS objects.