GCN Circular 25380

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 190817.35 (  1h 21m 12.00s , -22d  0m 00.00s, R=3) errorbox  10 sec after notice time and 1220 sec after trigger time at 2019-08-17 08:45:22 UT, with upper limit up to  17.5 mag. The observations began at zenit distance = 11 deg. The sun  altitude  is -31.2 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=1108283

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    1311 | 2019-08-17 08:45:22 |         MASTER-OAFA | (  1h 20m 13.42s , -22d  7m 27.37s) |   C |   180 | 16.7 |        
    1491 | 2019-08-17 08:45:22 |         MASTER-OAFA | (  1h 20m 13.42s , -22d  7m 27.42s) |   C |   540 | 17.5 |  Coadd 
    1535 | 2019-08-17 08:49:07 |         MASTER-OAFA | (  1h 20m 13.19s , -22d  7m 27.40s) |   C |   180 | 16.9 |        
    1759 | 2019-08-17 08:52:50 |         MASTER-OAFA | (  1h 20m 13.09s , -22d  7m 27.30s) |   C |   180 | 16.9 |        
    1984 | 2019-08-17 08:56:35 |         MASTER-OAFA | (  1h 20m 13.04s , -22d  7m 27.59s) |   C |   180 | 17.0 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.