TITLE:   GCN CIRCULAR
NUMBER:  25797
SUBJECT: Baksan Neutrino Observatory Alert 190920.65: Global MASTER-Net observations report
DATE:    19/09/21 05:40:00 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

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 190920.65 (07h 07m 12.000s , -26d 18m 00.00s, R=3) errorbox  29473 sec after trigger time at 2019-09-20 23:40:34 UT, with upper limit up to  17.5 mag. The observations began at zenit distance = 74 deg. The sun  altitude  is -55.1 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=1143310

We obtain a following upper limits.  

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

   29504 | 2019-09-20 23:40:34 |         MASTER-SAAO | (06h 45m 12.012s , -25d 56m 27.44s) |   C |    60 | 17.5 |        
   29701 | 2019-09-20 23:43:51 |         MASTER-SAAO | (06h 52m 30.145s , -27d 56m 17.51s) |   C |    60 | 17.3 |        
   29896 | 2019-09-20 23:47:07 |         MASTER-SAAO | (06h 45m 13.706s , -25d 56m 40.21s) |   C |    60 | 17.4 |        
   30004 | 2019-09-20 23:48:54 |         MASTER-SAAO | (06h 54m 07.540s , -25d 56m 11.06s) |   C |    60 | 17.3 |        
   30101 | 2019-09-20 23:50:32 |         MASTER-SAAO | (06h 52m 29.142s , -27d 56m 11.03s) |   C |    60 | 17.4 |        
   30200 | 2019-09-20 23:52:10 |         MASTER-SAAO | (07h 01m 32.500s , -27d 56m 22.35s) |   C |    60 | 17.1 |        
   30506 | 2019-09-20 23:57:16 |         MASTER-SAAO | (06h 54m 06.722s , -25d 56m 04.32s) |   C |    60 | 17.5 |        
   30610 | 2019-09-20 23:59:01 |         MASTER-SAAO | (07h 01m 32.921s , -27d 56m 16.89s) |   C |    60 | 17.2 |        
   30823 | 2019-09-21 00:02:34 |         MASTER-SAAO | (07h 03m 00.626s , -25d 55m 52.49s) |   C |    60 | 17.5 |        
   30950 | 2019-09-21 00:04:40 |         MASTER-SAAO | (07h 10m 37.763s , -27d 56m 05.19s) |   C |    60 | 17.1 |        
   31060 | 2019-09-21 00:06:31 |         MASTER-SAAO | (06h 56m 10.738s , -23d 55m 55.49s) |   C |    60 | 17.5 |        
Filter C is a clear (unfiltred) band. 


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