TITLE: GCN CIRCULAR NUMBER: 26289 SUBJECT: LIGO/Virgo S191124be: Global MASTER-Net observations report DATE: 19/11/24 11:08:34 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the LIGO/Virgo S191124be errorbox 1625 sec after trigger time at 2019-11-24 10:26:23 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 42 deg. The sun altitude is -11.7 deg. MASTER-Amur robotic telescope located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the LIGO/Virgo S191124be errorbox 1630 sec after trigger time at 2019-11-24 10:26:28 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 57 deg. The sun altitude is -26.5 deg. The galactic latitude b = 38 deg., longitude l = 76 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=10937 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 1715 | 2019-11-24 10:26:23 | MASTER-Tunka | (16h 57m 57.68s , +49d 37m 57.3s) | P| | 180 | 18.0 | 1660 | 2019-11-24 10:26:28 | MASTER-Amur | (16h 49m 12.48s , +49d 13m 14.4s) | C | 60 | 18.0 | 1740 | 2019-11-24 10:27:47 | MASTER-Amur | (16h 49m 08.75s , +49d 12m 12.7s) | C | 60 | 18.0 | 1819 | 2019-11-24 10:29:07 | MASTER-Amur | (16h 49m 15.58s , +49d 12m 37.4s) | C | 60 | 18.0 | 1915 | 2019-11-24 10:29:42 | MASTER-Tunka | (16h 57m 57.19s , +49d 36m 59.9s) | P| | 180 | 18.1 | 1899 | 2019-11-24 10:30:26 | MASTER-Amur | (16h 49m 12.59s , +49d 13m 42.8s) | C | 60 | 18.0 | 2114 | 2019-11-24 10:33:02 | MASTER-Tunka | (16h 57m 59.03s , +49d 38m 28.7s) | P| | 180 | 18.2 | 3452 | 2019-11-24 10:55:20 | MASTER-Tunka | (16h 57m 56.59s , +49d 37m 12.0s) | P| | 180 | 18.4 | 3652 | 2019-11-24 10:58:39 | MASTER-Tunka | (16h 57m 53.74s , +49d 38m 10.0s) | P| | 180 | 18.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.