TITLE: GCN CIRCULAR NUMBER: 16043 SUBJECT: GRB 140320D: MASTER optical observations DATE: 14/03/30 08:42:43 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University E. Gorbovskoy, V. Lipunov, M. Pruzhinskaya, D.Denisenko, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope located in Tunka (MASTER-Net: http://observ.pereplet.ru) have done a survey of the large area around IPN error box (Hurley et. al. GCN16023). The survey was started 2014-03-21 13:15:06 i.e. 16h 53m after the burst and proceeded during 5 hours. The 5 sigma unfiltered upper limit was ~17.5 m on single 180 image and ~18.8 m on coadd of 5 images with total exposure 900 s. We haven`t found credible optical afterglow candidate within IPN error box. The covarege map is available at http://master.sai.msu.ru/static/GRB/GRB140320D_map.png The message may be cited.