TITLE: GCN CIRCULAR NUMBER: 20315 SUBJECT: GRB 161220A: LCO-FTS observations DATE: 16/12/21 06:57:45 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc (U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large collaboration report: We observed Swift GRB 161220A (D'Elia et al. GCN 20302) on December 20, from 11:02 to 11:13 UT (2.5-2.7 hours since the GRB) with the 2-m LCO Faulkes Telescope South in Siding Springs with the SDSS i filter under poor sky transparency conditions. Within the XRT error circle we do not find any object brighter than i~20 mag (total exposure of 5x120s) as calibrated against nearby USNOB1 stars.