TITLE: GCN CIRCULAR NUMBER: 9468 SUBJECT: GRB 090528B: MASTER-II Kourovka optical limit DATE: 09/06/01 08:30:40 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Krushinski, I.Zalognikh, A.Popov, T.Kopytova Ural State University, Kourovka E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov Sternberg Astronomical Institute, Moscow State University K.Ivanov, S.Yazev Irkutsk State University A. Tlatov, A.V. Parhomenko, Kislovodsk Solar Station of the Pulkovo Observatory MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru, 2x500mm,2 x 4 square degrees, 2 x 16Mpx Apogee CCD) located at Kourovka Observatory has observed FERMI error box GRB_RA: 313.740d {+20h 54m 58s} (J2000) GRB_DEC: +32.350d {+32d 21' 00"} (J2000) 1.18 degres error box radius (Trigg Number 265206153) starting after sunset (19:18:23.275, ~7 hours after GRB time) with 180s exposure in R and V filters simultaniuosly at ~60 degrees zenit distance. Robot do not detect OT with limit: R>19.0 V>18.1 Our images cover 30% last 1 sigma error box (A. von Kienlin, GCN Circ 9447) The R-image is available at http://observ.pereplet.ru/images/GRB090528B/grb090528B.jpeg The black circle is A. von Kienlin, GCN Circ 9447 error box. The message may be cited. mailto: lipunov@sai.msu.ru