TITLE: GCN CIRCULAR NUMBER: 23016 SUBJECT: GRB 180720C: BOOTES-2/TELMA optical observations DATE: 18/07/22 18:53:13 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia C. Perez del Pulgar and A. Castellon (Univ. de Malaga), E. Fernandez-Garcia, Y. Hu, I. Carrasco and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration, report: The 60cm BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Spain) automatically responded in 53s (and 132s after the GRB onset) to the Swift trigger of GRB 180720C (LaPorte et al., GCNC 22982). The first image (10s exposure, unfiltered) was obtained at 22:26:09 UT. At the position of the Swift X-ray afterglow (Evans et al. GCNC 22987), no optical afterglow is detected down 18 mag in this crowded field in the direction of the Galactic Center (i.e. high extinction towards the source is very likely present). This is consistent with the limits reported by Guidorzi et al. (GCNC 22991), Oates et al. (GCNC 22992) and Gorbovskoy et al. (GCNC 23009). The message may be cited.