TITLE: GCN CIRCULAR NUMBER: 18768 SUBJECT: LIGO/Virgo G211117: MASTER Observations of the 3 iPTF candidates DATE: 15/12/30 11:11:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, N.Tyurina Lomonosov Moscow State University, Sternberg Astronomical Institute After MASTER DataBase checking we found: iPTF15fev - Known old SN ASAS15rw MASTER-IAC Light Curve http://master.sai.msu.ru/static/OT/iPTFfev.jpg iPTF15fel - 2015-12-16 23:07:20 visible in MASTER-IAC PSN detected 10 days before G211117 iPTF15ffm - observed by MASTER-IAC from 2015-11-15 22:14:53.869 so >40 days before trigger The reduction is continuated. The delay is connected with yang age of the MASTER-IAC survey (started June 2015). So we lost time to transfere parts of DATABase from Russia to IAC telescope.