TITLE: GCN CIRCULAR NUMBER: 27829 SUBJECT: Baksan Neutrino Observatory Alert 200526.85: Global MASTER-Net observations report DATE: 20/05/26 23:21:08 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa, I.Gorbunov, D.Vlasenko, V.Vladimirov, A.Kuznetsov, A. Chasovnikov, V.Topolev, D.Kuvshinov, F.Balakin, V.A. Senik (Lomonosov Moscow State University, SAI, Physics Department), V.B. Petkov, M.M. Boliev, A.N. Kurenya, (Baksan Neutrino Observatory, Institute for Nuclear Research of RAS, Moscow, Russia), R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), N.M. Budnev, O. Gress, O.Ershova (Applied Physics Institute, Irkutsk State University), V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), R. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA, San Juan National University), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE SJNU) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Baksan Neutrino Observatory Alert 200526.85 (trigger No 1641241576,15h 05m 36.00s , -71d 18m 00.0s, R=3) errorbox 7387 sec after notice time and 7945 sec after trigger time at 2020-05-26 22:38:40 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 52 deg. The sun altitude is -12.1 deg. The galactic latitude b = -12 deg., longitude l = 314 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1366941 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 7975 | 2020-05-26 22:38:40 | MASTER-OAFA | (14h 35m 22.93s , -69d 53m 33.0s) | C | 60 | 17.1 | 8067 | 2020-05-26 22:40:12 | MASTER-OAFA | (15h 22m 01.35s , -69d 55m 27.2s) | C | 60 | 17.2 | 8158 | 2020-05-26 22:41:43 | MASTER-OAFA | (14h 44m 31.47s , -67d 54m 37.9s) | C | 60 | 17.2 | 8249 | 2020-05-26 22:43:14 | MASTER-OAFA | (15h 27m 04.38s , -67d 55m 03.0s) | C | 60 | 17.1 | 8340 | 2020-05-26 22:44:45 | MASTER-OAFA | (14h 35m 19.54s , -69d 52m 46.0s) | C | 60 | 17.5 | 8431 | 2020-05-26 22:46:16 | MASTER-OAFA | (14h 58m 44.84s , -69d 54m 19.1s) | C | 60 | 17.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.