TITLE: GCN CIRCULAR NUMBER: 23905 SUBJECT: GRB190219A: MASTER Global Robotic Net optical observation DATE: 19/02/19 21:53:13 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, D.Zimnukhov, A.Kuznetsov, P.Balanutsa, A. Chasovnikov, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), O. Gress, N.M. Budnev, O.Ershova, Yu.Ishmuhametova (Applied Physics Institute, 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, A.V. Parhomenko, 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-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 GRB190219A (Beardmore et al. GCN 23902 Ttrig=19:38:58 UT) 16 sec after notice time (55 sec after trigger time) at 2019-02-19 19:39:53 UT. On our first (10s exposure) set we don`t find optical transient within SWIFT error-box (Evans et al. GCN 23903 12 38 30.33 +76 36 46.2 +-2.1arcsec). The 5-sigma upper limit has been about 16.2mag at 10-s first exposition, 16.7m on the 30-sec.exp., started at 2019-02-19 19:41:28UT. The galactic latitude b = 41 deg., longitude l = 124 deg. The observations started on zenit distance = 28 deg. The moon (100 % bright part) altitude was 32 deg.The distance between moon and object is 66deg. The sun altitude was -28.1 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the GRB190219.82 21 sec after notice time (60 sec after trigger time) at 2019-02-19 19:39:58 UT. On our first (10s exposure) there is no new OT inside Swift XRT error box brighter than 16.5. The observations started on zenit distance = 41 deg. The sun altitude was -50.7 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the GRB190219.82 18 sec after notice time (57 sec after trigger time) at 2019-02-19 19:39:55 UT. On our first (10s exposure) there is no optical transient within SWIFT error-box . with the 5-sigma upper limit about 17.44mag The observations started on zenit distance = 42 deg. The sun altitude was -45.5 deg. MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) was pointed to the GRB190219.82 20 sec after notice time (59 sec after trigger time) at 2019-02-19 19:39:57 UT. On our first (10s exposure) set there is no optical transient within SWIFT error-box with the 5-sigma upper limit about 15.5 The observation started when error box altitude was 21deg. Observations started at twilight. The sun altitude was -9.9 deg. MASTER-Tunka robotic telescope ocated in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the GRB190219.82 29 sec after notice time (71 sec after trigger time) at 2019-02-19 19:40:09 UT. On our first (10s exposure) there is no optical transient within SWIFT error-box with the 5-sigma upper limit 15mag The observations made on zenit distance = 25 deg. The sun altitude is -40.6 deg.