TITLE: GCN CIRCULAR NUMBER: 27319 SUBJECT: Swift GRB200306.01: Global MASTER-Net observations report DATE: 20/03/06 00:34:28 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB200306.01 (trigger No 959917,06h 44m 24.72s , -62d 00m 18.0s, R=0.00130556) errorbox 12 sec after notice time and 49 sec after trigger time at 2020-03-06 00:21:46 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 31 deg. The sun altitude is -17.1 deg. The galactic latitude b = -24 deg., longitude l = 272 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1305993 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 55 | MASTER-OAFA | C | 10 | 17.2 | 96 | MASTER-OAFA | C | 10 | 17.2 | 144 | MASTER-OAFA | C | 20 | 17.7 | 201 | MASTER-OAFA | C | 30 | 18.0 | 274 | MASTER-OAFA | C | 50 | 18.3 | 361 | MASTER-OAFA | C | 60 | 18.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.