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GCN Circular 28497

Subject
Fermi GRB 200925A: Global MASTER-Net observations report
Date
2020-09-25T16:15:19Z (4 years ago)
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 Fermi GRB 200925A ( Fermi GBM team, GCN 28496) errorbox  108 sec after notice time and 146 sec after trigger time at 2020-09-25 14:40:29 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 80 deg. The sun  altitude  is -32.2 deg. 

The galactic latitude b =  8 deg., longitude l = 181 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1448925

We obtain a following upper limits.  

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

     162 | 2020-09-25 14:40:29 |        MASTER-Tunka | (05h 49m 18.34s , +33d 03m 21.2s) |  P| |    30 | 15.6 |        
     216 | 2020-09-25 14:41:19 |        MASTER-Tunka | (05h 49m 25.59s , +33d 02m 22.8s) |  P| |    40 | 15.8 |        
     281 | 2020-09-25 14:42:18 |        MASTER-Tunka | (05h 49m 18.49s , +33d 01m 25.3s) |  P| |    50 | 16.0 |        
     356 | 2020-09-25 14:43:28 |        MASTER-Tunka | (05h 49m 24.92s , +33d 01m 42.2s) |  P| |    60 | 16.1 |        
     625 | 2020-09-25 14:47:57 |        MASTER-Tunka | (05h 41m 20.99s , +33d 40m 09.3s) |   C |    60 | 17.2 |        
     704 | 2020-09-25 14:49:16 |        MASTER-Tunka | (05h 49m 54.30s , +35d 40m 14.4s) |   C |    60 | 17.6 |        
     944 | 2020-09-25 14:53:17 |        MASTER-Tunka | (06h 00m 43.95s , +33d 40m 25.8s) |   C |    60 | 17.5 |        
    1266 | 2020-09-25 14:58:38 |        MASTER-Tunka | (05h 40m 01.57s , +35d 39m 22.7s) |   C |    60 | 17.8 |        
    1427 | 2020-09-25 15:01:19 |        MASTER-Tunka | (05h 49m 05.70s , +37d 40m 29.4s) |   C |    60 | 17.8 |        
    1589 | 2020-09-25 15:04:01 |        MASTER-Tunka | (05h 52m 36.69s , +31d 39m 53.6s) |   C |    60 | 17.0 |        
    1668 | 2020-09-25 15:05:21 |        MASTER-Tunka | (05h 45m 13.96s , +29d 40m 30.4s) |   C |    60 | 17.2 |        
    1831 | 2020-09-25 15:08:03 |        MASTER-Tunka | (05h 40m 02.08s , +35d 40m 32.1s) |   C |    60 | 17.9 |        
    1910 | 2020-09-25 15:09:22 |        MASTER-Tunka | (05h 49m 06.27s , +37d 39m 39.3s) |   C |    60 | 17.7 |        
    2073 | 2020-09-25 15:12:06 |        MASTER-Tunka | (05h 59m 14.54s , +37d 40m 05.8s) |   C |    60 | 17.9 |        
    2238 | 2020-09-25 15:14:50 |        MASTER-Tunka | (06h 09m 35.88s , +35d 40m 57.4s) |   C |    60 | 17.8 |        
    2401 | 2020-09-25 15:17:33 |        MASTER-Tunka | (05h 59m 12.36s , +37d 40m 10.1s) |   C |    60 | 18.0 |        
    2481 | 2020-09-25 15:18:53 |        MASTER-Tunka | (06h 09m 24.29s , +37d 41m 53.7s) |   C |    60 | 17.9 |        
    2565 | 2020-09-25 15:20:17 |        MASTER-Tunka | (06h 11m 28.89s , +31d 41m 50.1s) |   C |    60 | 17.4 |        
    2724 | 2020-09-25 15:22:56 |        MASTER-Tunka | (06h 03m 48.95s , +29d 41m 01.2s) |   C |    60 | 16.8 |        
    2803 | 2020-09-25 15:24:15 |        MASTER-Tunka | (06h 09m 18.37s , +37d 40m 08.5s) |   C |    60 | 17.9 |        
    3047 | 2020-09-25 15:28:19 |        MASTER-Tunka | (05h 56m 50.08s , +27d 40m 30.9s) |   C |    60 | 17.1 |        
    3126 | 2020-09-25 15:29:39 |        MASTER-Tunka | (05h 59m 04.82s , +39d 41m 53.6s) |   C |    60 | 18.2 |        
    3368 | 2020-09-25 15:33:40 |        MASTER-Tunka | (06h 20m 00.76s , +33d 40m 39.0s) |   C |    60 | 17.7 |        
    3447 | 2020-09-25 15:34:59 |        MASTER-Tunka | (05h 59m 07.43s , +39d 42m 15.0s) |   C |    60 | 18.2 |        
    5109 | 2020-09-25 16:02:41 |        MASTER-Tunka | (06h 09m 35.35s , +39d 41m 25.8s) |   C |    60 | 15.3 |        
    5191 | 2020-09-25 16:04:03 |        MASTER-Tunka | (06h 19m 31.73s , +37d 41m 19.3s) |   C |    60 | 13.9 |        
Filter C is a clear (unfiltred) band. 


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