TITLE: GCN CIRCULAR NUMBER: 23085 SUBJECT: GRB 180805B: MASTER optical late inspection short GRB with extended emission DATE: 18/08/06 10:52:37 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, N.Tiurina, E. Gorbovskoy, V.Kornilov, A.Kuznetsov, V.Chazov, I. Gorbunov, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov, D. Vlasenko Lomonosov Moscow State University,SAI 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) A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory 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-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in SAAO was starting survey on the Swift short GRB with extended emission GRB180805B (D'Avanzo et al., GCN #23076; Hamburg et al., GCN #23078;Sakamoto et al., GCN #23082) error-box (Evans et al., GCN #23077; ) 37838 sec after notice time and 38322 sec after trigger time at 2018-08-05 23:46:00 UT. The 5-sigma upper limit on our first (180s exposure) set is about 20.5 mag There is no OT detected. The message may be cited.