TITLE: GCN CIRCULAR NUMBER: 23348 SUBJECT: FRB 181016: MASTER optical inspection of the Fast Radio Burst error box DATE: 18/10/19 14:42:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, N.Tiurina, V.Kornilov, A.Kuznetsov, V.Chazov, I. Gorbunov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov, D. Vlasenko Lomonosov Moscow State University,SAI MSU A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory D. Buckley, South African Astronomical Observatory (SAAO) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias (IAC) R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA) H.Levato, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) O. Gres, N.M.Budnev , Yu.Ishmuhametova Irkutsk State University (ISU) A. Gabovich, V. Yurkov, Yu. Sergienko Blagoveschensk Educational State University (BSPU) MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was starting survey on the FRB 181016A (Farah et al. ATel #12124 ) 2 days 46822 sec after trigger time at 2018-10-18 17:17:18 UT. We cover full error box. No new OT was found. The 5-sigma upper limit on our images is about 18.5 mag The coverage map is available here http://master.sai.msu.ru/static//FRB/db/FRB181016A/img/ligo_master_2018-10-19-08-58-37.eb.zoom.1.pngmlimit.png The message may be cited.