TITLE:   GCN CIRCULAR
NUMBER:  28516
SUBJECT: IceCube Alert 200926.94: Global MASTER-Net observations report 
DATE:    20/09/27 21:39:12 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

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,  D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),

R. Podesta, C.Lopez, F. Podesta, C.Francile 
(Observatorio Astronomico Felix Aguilar OAFA),

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 IceCube Alert 200926.94 (trigger No 41069485,12h 19m 00.00s , +32d 55m 48.0s, R=1.81) errorbox  50393 sec after notice time and 50557 sec after trigger time at 2020-09-27 12:38:06 UT, with upper limit up to  16.8 mag. Observations started at twilight.  The observations began at zenith distance = 77 deg. The sun  altitude  is -16.9 deg. 

The galactic latitude b = 81 deg., longitude l = 171 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1449850

We obtain a following upper limits.  

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

   50647 | 2020-09-27 12:38:06 |        MASTER-Tunka | (12h 35m 32.98s , +32d 25m 36.7s) |   C |   180 | 12.8 |        
   81373 | 2020-09-27 21:11:12 |        MASTER-Tunka | (12h 27m 03.60s , +33d 47m 34.1s) |   C |    60 | 16.8 |        
   82175 | 2020-09-27 21:24:33 |        MASTER-Tunka | (12h 13m 31.51s , +29d 47m 44.2s) |   C |    60 | 16.7 |        
   82339 | 2020-09-27 21:27:18 |        MASTER-Tunka | (12h 29m 10.01s , +31d 47m 54.7s) |   C |    60 | 16.6 |        
Filter C is a clear (unfiltred) band. 


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