TITLE: GCN CIRCULAR NUMBER: 25475 SUBJECT: Fermi trigger No 588398821 Global MASTER-Net observations report DATE: 19/08/25 18:46:18 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 Fermi GRB190825.17 (trigger No 588398821, 14h 3m 26.40s , -74d 8m 24.00s, R=19.89) errorbox 51073 sec after trigger time at 2019-08-25 18:18:09 UT, with upper limit up to 19.9 mag. The observations began at zenit distance = 54 deg. The sun altitude is -26.2 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=1115181 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 51164 | 2019-08-25 18:18:09 | MASTER-SAAO | ( 18h 4m 57.28s , -85d 52m 26.90s) | C | 180 | 18.6 | 51386 | 2019-08-25 18:21:51 | MASTER-SAAO | ( 18h 5m 05.15s , -85d 53m 02.88s) | C | 180 | 19.5 | 52234 | 2019-08-25 18:35:59 | MASTER-SAAO | ( 18h 5m 25.59s , -85d 53m 25.80s) | C | 180 | 19.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.