TITLE: GCN CIRCULAR NUMBER: 29190 SUBJECT: Baksan Neutrino Observatory Alert 201228.36: Global MASTER-Net observations report DATE: 20/12/28 20:00:07 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-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 Baksan Neutrino Observatory Alert 201228.36 (trigger No 1659861662,03h 57m 12.00s , -35d 30m 00.0s, R=3) errorbox 38540 sec after notice time and 39026 sec after trigger time at 2020-12-28 19:31:28 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 7 deg. The sun altitude is -18.6 deg. The galactic latitude b = -49 deg., longitude l = 237 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1513333 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 39057 | 2020-12-28 19:31:28 | MASTER-SAAO | (03h 51m 04.56s , -36d 01m 19.9s) | C | 60 | 18.6 | 39219 | 2020-12-28 19:34:10 | MASTER-SAAO | (03h 57m 32.04s , -38d 01m 11.3s) | C | 60 | 18.6 | 39299 | 2020-12-28 19:35:30 | MASTER-SAAO | (03h 37m 05.51s , -38d 02m 46.0s) | C | 60 | 19.0 | 39909 | 2020-12-28 19:45:40 | MASTER-SAAO | (04h 10m 51.80s , -35d 59m 15.1s) | C | 60 | 18.7 | 39989 | 2020-12-28 19:47:00 | MASTER-SAAO | (04h 04m 33.93s , -40d 00m 35.8s) | C | 60 | 18.7 | 40068 | 2020-12-28 19:48:19 | MASTER-SAAO | (03h 51m 02.99s , -36d 02m 04.3s) | C | 60 | 18.5 | 40311 | 2020-12-28 19:52:22 | MASTER-SAAO | (04h 17m 48.57s , -38d 01m 04.9s) | C | 60 | 18.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.