TITLE: GCN CIRCULAR NUMBER: 19427 SUBJECT: FACT follow-up of the IceCube event 160427A DATE: 16/05/13 13:02:18 GMT FROM: Daniela Dorner at U of Wuerzburg A. Biland (ETH Zurich) and D. Dorner (University of Wuerzburg, FAU Erlangen) report on behalf of the FACT collaboration: On April 27th, 2016, the IceCube collaboration reported the detection of a high-energy neutrino (GCN #19363) with the updated position of RA=240.57d and DEC=+9.34d (J2000) and a position error of 0.6 degrees radius provided at 23:24:24 UTC on April 27th. FACT observed the updated position the following two nights on 2016-04-28 from 2 UTC to 4:30 UTC and on 2016-04-29 from 1:30 UTC to 3:30 UTC with a total on-time of about 4.2 hours. While in the first night, there were clouds most of the time during the observation, the weather conditions were good during the second night. The automatic Quick Look Analysis (http://www.fact-project.org/monitoring) does not show any signal from the source position in the data of the two nights http://fact-project.org/monitoring/index.php?y=2016&m=04&d=28&source=19&timebin=12&plot=week The First G-APD Cherenkov Telescope (FACT) is an imaging air Cherenkov telescope monitoring at TeV energies. It is located in the Observatorio del Roque de los Muchachos on the Canary Island La Palma.