TITLE: GCN CIRCULAR NUMBER: 19609 SUBJECT: GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI DATE: 16/06/28 13:14:00 GMT FROM: Kunal Mooley at Oxford U K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), 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 the Fermi/LAT GRB 160623A (Vianello et al., GCN 19553) with the AMI Large Array at 15 GHz on 2016 Jun 25.15 and Jun 27.15 (UT), 2.0 and 4.0 days post-burst, as part of the 4pisky program. We detect an uncataloged variable radio source at the XRT location (Mingo et al., GCN 19558) at 5.0+/-0.1 mJy and 6.3+/-0.1 mJy (preliminary) respectively. Monitoring of this source is underway. 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/.