TITLE: GCN CIRCULAR NUMBER: 23770 SUBJECT: GRB 190123A: MASTER Global Robotic Net optical observation DATE: 19/01/23 13:27:41 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E. Gorbovskoy, N.Tiurina, P.Balanutsa, D.Vlasenko, V.Vladimirov, A.Kuznetsov, D.Kuvshinov, A.Chasovnikov (Lomonosov Moscow State University,SAI, Physics Department), O. Gres, N.M. Budnev, (Applied Physics Institute of Irkutsk State University) V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias) D. Buckley (South African Astronomical Observatory) A. Tlatov, V.Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) R. Podesta, C. Lopez, C.Francile, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE) MASTER-Tunka robotic telescope (MASTER Global Robotic Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, v.2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the GRB190123A 17 sec after notice time (66 sec after trigger time) at 2019-01-23 12:20:25 UT. On our first (10s exposure) image we don't find optical transient within SWIFT-XRT error-box ( A. D'Ai et al. GCN 23769 RA,Dec(2000)=03h 32m 52.97s +45d 31' 27.3" r=4") up to 16.7 unfiltered magnitude limit (5-sigma) The galactic latitude b = -8 deg., longitude l = 151 deg. The observations made on zenit distance = 7 deg. The Moon altitude is -1 deg. (92 % bright part) The sun altitude is -24.7 deg. MASTER-Amur robotic telescope ocated in Russia (Blagoveshchensk State Pedagogical University) was pointed to the GRB190123A 27 sec after notice time (77 sec after trigger time) at 2019-01-23 12:20:35 UT. On our first (10s exposure, mlim=16.3 (5-sigma)) image we don't find optical transient within SWIFT-XRT error-box. The observations made on zenit distance = 15 deg. The moon (92 % bright part) is 14 deg. above the horizon. The sun altitude is -40.1 deg. The message may be cited.