TITLE: GCN CIRCULAR NUMBER: 18729 SUBJECT: LIGO/Virgo G211117: MASTER possible OT detection at the begining of inspection DATE: 15/12/27 23:04:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov, O.Gress Lomonosov Moscow State University, Sternberg Astronomical Institute D.Buckley South African Astronomical Observatory MASTER OT J020906.21+013800.1 - possible OT in PGC Galaxy. MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 02h 09m 06.21s +01d 38m 00.1s on 2015-12-27.85448 UT. The OT unfiltered magnitude is 18.3m (limit 20.0m). The OT is seen in 6 images. There is no minor planet at this place. There is PGC1200980 galaxy (it seems spiral galaxy and distance about 100 Mpc) very close to OT. The OT offset are 4.3E 1.5S arcsec. We have reference image without OT on 2015-06-07.17962 UT with unfiltered magnitude limit 18.9m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/020906.21013800.1.png This circular can be cited. -- Профессор Московского государственного университета им.М.В.Ломоносова Главный редактор Русского переплета http:www.pereplet.ru/avtori/lipunov.html The Principal Investigator of MASTER Global Robotic Net http://observ.pereplet.ru Professor of Lomonosov Moscow State University Physics Department, The Head of Space monitoring laboratory of Sternberg Astronomical Institute of Lomonosov MSU