TITLE: GCN CIRCULAR NUMBER: 23552 SUBJECT: GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box. DATE: 18/12/23 10:53:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Vladimirov, D. Vlasenko Lomonosov Moscow State University, SAI, Physics Department D. Buckley, South African Astronomical Observatory R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory O. Gres, N.M. Budnev, O.Ershova, Yu.Ishmuhametov Applied Physics Institute, Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez, F. Podesta, C.Francile Observatorio Astronomico Felix Aguilar (OAFA) H. Levato Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) MASTER-IAC robotic telescope (4 square degreess,Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the GRB181222B 107 sec after trigger time at 2018-12-22 20:13 24 UT in two polarizations. On our first ( 20s exposure ) set we not found optical transient within FERMI error-box (ra=311.146 dec=22.8597 r=1.6) The real time cover map is available https://master.sai.msu.ru/site/master2/event.php??not=2018-12-22%2020:20:57&sat=FERMI&gcrd=(311.146d,22.8597d)&eb=1.6&trig=2018-12-22%2020:11:37&n=GRB181222.84 ==================================================================== The galactic latitude b = -13 deg., longitude l = 67 deg. The observations made on zenit distance = 62 deg.The moon (100 % bright part) is 25 deg. above the horizon. The distance between moon and object is 122 The sun altitude is -27.2 deg. The object can be observed till sunrise at 2018-12-23 07:52:51 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 starting survey on the FERMI GRB181222B error-box (20 44 35 dec=+22 51 36, r=1.6) 45931 sec after notice time and 46503 sec after trigger time at 2018-12-23 09:06:40 UT. The 5-sigma upper limit on our first (60s exposure) set is about 16.5 mag The full information about this GRB181222B available here https://176.123.192.71//master2/grb.php?not=2018-12-22+20%3A21%3A08.37&sat=FERMI&gcrd=%28311.146d%2C22.86d%29&eb=1.6&trig=2018-12-22+20%3A11%3A37&n=GRB181222.84 The message may be cited. ==================================================================== The galactic latitude b = -13 deg., longitude l = 67 deg. The observations made on zenit distance = 44 deg. The moon (99 % bright part) is 8 deg. above the horizon. The distance between moon and object is 127. Observations started at twilight. The sun altitude is -14.6 deg. The object can be observed till 2018-12-23 14:13:01. The observations and reduction continue. The message may be cited.