TITLE: GCN CIRCULAR NUMBER: 18776 SUBJECT: LIGO/Virgo G211117: MAGIC very-high energy gamma-ray observations DATE: 15/12/30 16:14:44 GMT FROM: Antonio Stamerra at INAF-OATo/SNS-Pisa Angelo Antonelli (INAF-OaR), Alessandro Carosi (INAF-OaR), Barbara de Lotto (Univ. Udine), Razmik Mirzoyan (MPI-Müenchen) and Antonio Stamerra (INAF-OaTo and SNS-Pisa) on behalf of the MAGIC collaboration The MAGIC system of Cherenkov Telescopes, sensitive to high-energy gamma-ray above ~50 GeV, performed observations of 4 regions in the strip of the bayestar GW map for the trigger G211117. Observations started on December 28, 21 UT. Each observation covers a region of ~2.5x2.5 deg. Analysis is on-going. The list of targets is the following: Target 1: PGC1200980 (OT MASTER GCN#18729) RA,Dec (J2000): 02:09:05.8, +01:38:03.0 Duration: 42 min Target 2: strip from GW map RA,Dec (J2000): 02:38:38.93, +16:36:59.27 Duration: 56 min (moonlight conditions) Target 3: Field VST (GCN#18734) RA,Dec (J2000): 02:38:02.208, +19:13:12.00 Duration: 28 min (moonlight conditions) Target 4: Field VST (GCN#18734) RA,Dec (J2000): 03:18:23.712, +31:13:12.00 Duration: 30 min (moonlight conditions) MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.