GCN Circular 43099

Subject
EP251214a: Global MASTER-Net observations report
Event
EP251214a
Date
2025-12-14T19:09:20Z (a day ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, 
G.Antipov,  A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 

MASTER-Tunka robotic telescope  [1]  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the EP251214a ( EP Team et al., GCN 43087Loading...
 
 ) errorbox  23345 sec after notice time and 44450 sec after trigger time at 2025-12-14 14:47:51 UT, with upper limit up to  20.0 mag. The observations began at zenith distance = 80 deg. The sun  altitude  is -52.2 deg. 

The galactic latitude b = 50 deg., longitude l = 212 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3070739

We obtain a following upper limits.  

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

   11367 | 2025-12-14 05:35:57 |             MASTER- | (09h 49m 46.34s , +21d 15m 33.3s) |   C |    60 | 17.1 |        
   12140 | 2025-12-14 05:48:51 |             MASTER- | (09h 47m 03.54s , +20d 23m 17.9s) |   C |    60 | 18.1 |        
   12140 | 2025-12-14 05:48:51 |             MASTER- | (09h 58m 23.13s , +19d 21m 03.2s) |   C |    60 | 17.0 |        
   12427 | 2025-12-14 05:53:37 |             MASTER- | (09h 54m 39.28s , +22d 17m 23.3s) |   C |    60 | 18.4 |        
   28176 | 2025-12-14 10:15:06 |             MASTER- | (09h 45m 41.72s , +21d 23m 05.5s) |   C |   180 | 19.6 |        
   28176 | 2025-12-14 10:15:06 |             MASTER- | (09h 57m 15.83s , +20d 21m 58.5s) |   C |   180 | 19.3 |        
   44480 | 2025-12-14 14:47:51 |        MASTER-Tunka | (09h 53m 14.05s , +20d 49m 09.6s) |   C |    60 | 18.4 |        
   57811 | 2025-12-14 18:30:01 |        MASTER-Tunka | (09h 50m 07.21s , +22d 38m 41.9s) |   C |    60 | 20.0 |        
   57812 | 2025-12-14 18:30:02 |        MASTER-Tunka | (09h 49m 36.25s , +22d 46m 24.5s) |   C |    60 | 19.6 |        
   59105 | 2025-12-14 18:51:35 |        MASTER-Tunka | (09h 58m 44.22s , +20d 43m 39.4s) |   C |    60 | 19.6 |        
   59105 | 2025-12-14 18:51:35 |        MASTER-Tunka | (09h 58m 13.62s , +20d 51m 19.9s) |   C |    60 | 19.1 |        
Filter C is a clear (unfiltred) band. 


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

[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023,  Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html