TITLE: GCN CIRCULAR NUMBER: 20957 SUBJECT: GRB 170318B: 15 GHz upper limits from AMI DATE: 17/03/31 13:32:06 GMT FROM: Kunal Mooley at Oxford U K. P. Mooley (Hintze Fellow, Oxford) , T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester) The AMI Large Array robotically triggered on the Swift alert for GRB 170318B (Cholden-Brown et al., GCN 20908) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 Mar 19.11, Mar 21.17 and Mar 23.24 (UT) do not reveal any radio source at the XRT location (Goad et al., GCN 20910), with 3sigma upper limits of 300 uJy, 150 uJy and 315 uJy respectively. We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.