TITLE: GCN CIRCULAR NUMBER: 22297 SUBJECT: GRB 180102A: MASTER-Net robotic report DATE: 18/01/03 08:10:16 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Kuvshinov, A.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA), National University of San Juan, Argentina H. Levato, C. Saffe Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San Juan, Argentina D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, Irkutsk State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB180102A 23 sec after notice time and 43 sec after trigger time at 2018-01-02 15:50:27 UT (Page et al., GCN #22292; Veres GCN22295). On our first (10s exposure) set we haven`t found optical transient within Swift error-box (D'Ai et al., GCN #22296; Beardmore et al., GCN 22294). The 5-sigma upper limit has been about 13.7 mag The message may be cited. The observations made on zenit distance = 74 degrees, galaxy latitude b = 55 degree. The moon (99 % bright part) is 14 degrees above the horizon. The distance between moon and object is 73 The sun altitude is -22.3 degree. The object can be observed till sunrise at 2018-01-03 04:41:55. MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Crimea was pointed to the GRB180102.66 3221 sec after notice time and 3247 sec after trigger time at 2018-01-02 16:43:51 UT. On our 22-th (180s exposure) set we haven`t found optical transient within SWIFT error-box (ra=203.113 dec=62.1472 r=0.05). The message may be cited. The observations made on zenit distance = 73 degrees, galaxy latitude b = 55 degree. The moon (99 % bright part) is 18 degrees above the horizon. The distance between moon and object is 73 The sun altitude is -25.8 degree. The object can be observed till sunrise at 2018-01-03 05:20:03. MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB180102.66 21451 sec after notice time and 21471 sec after trigger time at 2018-01-02 21:47:35 UT. We not optical transient within SWIFT error-box (ra=203.113 dec=62.1472 r=0.05) brighter then 16.7. The 5-sigma upper limit has been about 16.24mag The message may be cited. The observations made on zenit distance = 12 degrees, galaxy latitude b = 55 degree. The moon (99 % bright part) is 20 degrees above the horizon. The distance between moon and object is 72 Observations started at twilight. The sun altitude is -15.2 degree. The object can be observed till sunrise at 2018-01-03 23:26:49 This message can be cited.