TITLE: GCN CIRCULAR NUMBER: 23976 SUBJECT: GRB190320A: MASTER OT detection DATE: 19/03/20 06:47:29 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, D.Zimnukhov, A.Kuznetsov, P.Balanutsa, A. Chasovnikov, V.Topolev, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O. Gress, N.M. Budnev, O.Ershova, Yu.Ishmuhametova, S.Yazev (Applied Physics Institute, Irkutsk State University), V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University), A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), R. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA, San Juan National University), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE, SJNU) MASTER-OAFA automatically pointed to Swift GRB 190320A (Kennea et al. GCN 23974, Gropp et al. GCN 23973, Lipunov et al. GCN 23975) detected MASTER OT J075123.56-455316.54 at position RA,Dec(2000)=07h 51m 23.56s , -45d 53m 16.54s Preliminary photometry is 2019-03-20 01:15:58.049 17.2 2019-03-20 01:19:25.483 17.4