TITLE: GCN CIRCULAR NUMBER: 33402 SUBJECT: IceCube Alert 230306.46: Global MASTER-Net observations report DATE: 23/03/06 11:39:12 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) 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 IceCube Alert 230306.46 (trigger No 79205800,04h 50m 20.40s , +34d 05m 16.8s, R=0.51) errorbox 917 sec after notice time and 973 sec after trigger time at 2023-03-06 11:15:43 UT, with upper limit up to 14.3 mag. The observations began at zenith distance = 25 deg. The sun altitude is -19.4 deg. The galactic latitude b = -6 deg., longitude l = 169 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2202545 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1063 | 2023-03-06 11:15:43 | MASTER-Amur | (04h 51m 23.50s , +34d 09m 54.7s) | P\ | 180 | 13.2 | 1662 | 2023-03-06 11:25:41 | MASTER-Amur | (04h 51m 22.01s , +34d 08m 43.1s) | P\ | 180 | 12.0 | 1786 | 2023-03-06 11:29:01 | MASTER-Amur | (04h 51m 21.02s , +34d 08m 01.8s) | C | 30 | 14.3 | 1887 | 2023-03-06 11:30:42 | MASTER-Amur | (04h 51m 19.07s , +34d 09m 42.4s) | C | 30 | 14.0 | 1939 | 2023-03-06 11:31:33 | MASTER-Amur | (04h 51m 25.95s , +34d 09m 05.1s) | C | 30 | 14.1 | 1990 | 2023-03-06 11:32:24 | MASTER-Amur | (04h 51m 18.96s , +34d 08m 02.1s) | C | 30 | 14.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.