TITLE: GCN CIRCULAR NUMBER: 23470 SUBJECT: GRB 181201A MASTER-Net OT detection DATE: 18/12/01 10:15:47 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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) V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, A.V. Krylov, I. Gorbunov, 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 V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk K. Ivanov, O. Gres, N.M. Budnev, S.Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University 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 MASTER-OAFA robotic telescope (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 GRB181201.11 10 sec after notice time and 18 sec after trigger time at 2018-12-01 02:40:30 UT. On our first (10s exposure) set we found 1 optical transient within INTEGRAL error-box (ra=319.317 dec=-12.6325 r=0.05) brighter than 16.2. T-Tmid Date Time Expt. Ra Dec Mag -------|---------------------|-------|-----------------|-----------------|------ 23 2018-12-01 02:40:30 10 ( 21h 17m 11.2s , -12d 37m 51.4s) |13.17 The 5-sigma upper limit has been about 16.2mag The message may be cited. ==================================================================== The galactic latitude b = -39 deg., longitude l = 39 deg. The observations made on zenit distance = 76 deg.The moon (38 % bright part) below the horizon (The altitude of the Moon is -41 deg. ). The sun altitude is -30.9 deg. The object can be observed till 2018-12-01 03:49:27