TITLE: GCN CIRCULAR NUMBER: 31741 SUBJECT: Integral GRB220311.69: Global MASTER-Net OT detection DATE: 22/03/11 16:45:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, F. Balakin, I. Gorbunov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the GRB220311.69 25 sec after notice time and 53 sec after trigger time at 2022-03-11 16:34:45 UT. On our first (10s exposure) set we found 1 optical transient within Integral error-box (ra=184.033 dec=66.7611 r=0.054167) brighter than 14.0. T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 58 2022-03-11 16:34:45 10 (12h 16m 05.22s , +66d 47m 23.8s) 13.5 The 5-sigma upper limit has been about 14.0mag The message may be cited.