TITLE: GCN CIRCULAR NUMBER: 20954 SUBJECT: GRB 170330A: LCO Cerro Tololo observations DATE: 17/03/31 11:29:20 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 170330A (D'Avanzo et al. GCN 20944) on March 31, 07:00 UT (8.5 hours since the GRB) with one 1-m LCO unit in Cerro Tololo with the SDSS i filter. Comparing with the PanSTARRS archive data, within the XRT error circle we do not find any new/variable source down to i>20.5 mag (with a total exposure of 10x120s at 8.7 hours mid time) as calibrated against nearby PanSTARRS sources.