TITLE: GCN CIRCULAR NUMBER: 19607 SUBJECT: SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst DATE: 16/06/28 12:55:20 GMT FROM: Kunal Mooley at Oxford U K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), T. Cantwell (Manchester), C. Rumsey, D. Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester) We observed SGR 1935+2154 with the AMI Large Array at 15 GHz at several epochs, obtaining the following upper limits (3sigma). This magnetar has been in outburst since 14 May 2016, with 39 Fermi/GBM triggers (Younes et al., GCN 19598) and at least 7 Swift/BAT triggers (e.g. Barthelmy et al., GCN 19590). The AMI-LA robotically triggered on all the BAT alerts. The non-detections in the radio indicate that the magnetar outburst has not seen any giant flare similar to SGR 1806-20 in Dec 2004. --------------------- Date S (UT) (uJy) --------------------- 2016 May 16.98 <282 2016 May 18.21 <144 2016 May 20.22 <108 2016 May 21.27 <147 2016 May 22.07 <129 2016 May 23.12 <204 2016 May 27.17 <111 2016 Jun 25.05 <132 2016 Jun 26.97 <360 --------------------- We thank the AMI staff for scheduling these observations.