TITLE: GCN CIRCULAR NUMBER: 23614 SUBJECT: SWIFT GRB190106.57 Global MASTER-Net OT detection DATE: 19/01/06 13:42:57 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, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe 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 GRB190106.57 20 sec after notice time and 36 sec after trigger time at 2019-01-06 13:35:20 UT. On our second (10s exposure) set , obtained 61 sec after tigger time at 2019-01-06 13:35:46 UT, we found 1 optical transient within SWIFT error-box (ra=29.8792 dec=23.8567 r=0.05) brighter than 16.06. T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 66 2019-01-06 13:35:46 10 ( 1h 59m 31.19s , +23d 50m 44.79s) 15.23 The 5-sigma upper limit has been about 16.06mag The message may be cited. ==================================================================== The galactic latitude b = -36 deg., longitude l = 143 deg. The observations made on zenit distance = 45 deg.The moon ( 0 % bright part) below the horizon (The altitude of the Moon is -50 deg. ). The sun altitude is -53.8 deg. The object can be observed till 2019-01-07 18:34:53 .