GCN Circular 43127

Subject
EP251214b: Global MASTER-Net observations report
Event
EP251214b
Date
2025-12-15T16:09:37Z (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-OAFA robotic telescope  [1]  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP251214b ( EP Team et al., GCN 43125Loading...
 
 ) errorbox 1777 sec after trigger time at 2025-12-14 07:49:59 UT, with upper limit up to  20.5 mag. The observations began at zenith distance = 14 deg. The sun  altitude  is -17.5 deg. 

The galactic latitude b = 22 deg., longitude l = 256 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3071744

We obtain a following upper limits.  

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

    1807 | 2025-12-14 07:49:59 |         MASTER-OAFA | (09h 37m 50.45s , -22d 35m 38.5s) |   C |    60 | 20.5 |        
    1873 | 2025-12-14 07:51:04 |         MASTER-OAFA | (09h 37m 50.56s , -22d 35m 35.8s) |   C |    60 | 20.5 |        
    1939 | 2025-12-14 07:52:10 |         MASTER-OAFA | (09h 37m 50.68s , -22d 35m 33.3s) |   C |    60 | 20.5 |        
    2004 | 2025-12-14 07:53:16 |         MASTER-OAFA | (09h 37m 50.79s , -22d 35m 30.8s) |   C |    60 | 20.4 |        
    2070 | 2025-12-14 07:54:22 |         MASTER-OAFA | (09h 37m 50.91s , -22d 35m 28.4s) |   C |    60 | 20.4 |        
    2137 | 2025-12-14 07:55:28 |         MASTER-OAFA | (09h 37m 51.00s , -22d 35m 26.1s) |   C |    60 | 20.5 |        
    2202 | 2025-12-14 07:56:34 |         MASTER-OAFA | (09h 37m 51.12s , -22d 35m 23.9s) |   C |    60 | 20.4 |        
    2268 | 2025-12-14 07:57:39 |         MASTER-OAFA | (09h 37m 51.21s , -22d 35m 21.8s) |   C |    60 | 20.5 |        
    2334 | 2025-12-14 07:58:45 |         MASTER-OAFA | (09h 37m 51.29s , -22d 35m 19.7s) |   C |    60 | 20.5 |        
    2399 | 2025-12-14 07:59:51 |         MASTER-OAFA | (09h 37m 51.36s , -22d 35m 17.2s) |   C |    60 | 20.4 |        
    2465 | 2025-12-14 08:00:57 |         MASTER-OAFA | (09h 37m 51.42s , -22d 35m 15.1s) |   C |    60 | 20.5 |        
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