TITLE: GCN CIRCULAR NUMBER: 25267 SUBJECT: MAXI GRB190804.33 Global MASTER-Net observations report DATE: 19/08/04 21:01:05 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias) D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the MAXI GRB190804.33 (trigger No 6992871870, 15h 57m 44.64s , -44d 23m 13.20s, R=1) errorbox 32405 sec after trigger time at 2019-08-04 16:58:20 UT, with upper limit up to 19.5 mag. Observations started at twilight. The observations began at zenit distance = 14 deg. The sun altitude is -11.8 deg. MASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) started inspect of the MAXI GRB190804.33 errorbox 45665 sec after trigger time at 2019-08-04 20:39:20 UT, with upper limit up to 16.4 mag. Observations started at twilight. The observations began at zenit distance = 72 deg. The sun altitude is -10.7 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1095913 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 32436 | 2019-08-04 16:58:20 | MASTER-SAAO | ( 15h 52m 08.48s , -43d 54m 03.18s) | C | 60 | 18.2 | 32592 | 2019-08-04 16:59:56 | MASTER-SAAO | ( 15h 57m 42.32s , -44d 17m 23.77s) | C | 180 | 19.1 | 32755 | 2019-08-04 17:03:39 | MASTER-SAAO | ( 15h 50m 50.95s , -43d 54m 24.34s) | C | 60 | 18.5 | 32851 | 2019-08-04 17:05:15 | MASTER-SAAO | ( 16h 1m 58.45s , -43d 54m 38.91s) | C | 60 | 18.8 | 33008 | 2019-08-04 17:06:52 | MASTER-SAAO | ( 16h 2m 51.67s , -44d 16m 44.63s) | C | 180 | 19.5 | 33167 | 2019-08-04 17:10:31 | MASTER-SAAO | ( 16h 3m 07.03s , -43d 54m 23.19s) | C | 60 | 18.9 | 45696 | 2019-08-04 20:39:20 | MASTER-IAC | ( 16h 0m 30.33s , -43d 56m 36.85s) | C | 60 | 16.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.