[vsnet-grb-info 41345] EP251229a: Global MASTER-Net observations report

30 Dec 2025

      TITLE:   GCN CIRCULAR
NUMBER:  43254
SUBJECT: EP251229a: Global MASTER-Net observations report
DATE:    25/12/30 01:54:26 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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 EP251229a ( EP Team et al., GCN 43253) errorbox 635 sec after trigger time at 2025-12-29 20:09:24 UT, with upper limit up to  15.9 mag. The observations began at zenith distance = 19 deg. The sun  altitude  is -45.6 deg. 

The galactic latitude b = 33 deg., longitude l = 185 deg.

Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3090301

We obtain a following upper limits.  

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

     665 | 2025-12-29 20:09:24 |        MASTER-Tunka | (08h 15m 31.75s , +37d 38m 46.9s) |  P- |    60 | 15.1 |        
     665 | 2025-12-29 20:09:24 |        MASTER-Tunka | (08h 14m 38.46s , +37d 47m 55.5s) |  P| |    60 | 14.4 |        
     729 | 2025-12-29 20:10:27 |        MASTER-Tunka | (08h 15m 31.53s , +37d 38m 43.3s) |  P- |    60 | 15.7 |        
     729 | 2025-12-29 20:10:27 |        MASTER-Tunka | (08h 14m 38.47s , +37d 47m 47.0s) |  P| |    60 | 13.9 |        
     792 | 2025-12-29 20:11:31 |        MASTER-Tunka | (08h 15m 31.64s , +37d 38m 42.0s) |  P- |    60 | 15.7 |        
     792 | 2025-12-29 20:11:31 |        MASTER-Tunka | (08h 14m 38.68s , +37d 47m 50.3s) |  P| |    60 | 14.4 |        
     856 | 2025-12-29 20:12:34 |        MASTER-Tunka | (08h 15m 31.62s , +37d 38m 39.6s) |  P- |    60 | 15.7 |        
     856 | 2025-12-29 20:12:34 |        MASTER-Tunka | (08h 14m 42.54s , +37d 48m 11.2s) |  P| |    60 | 11.9 |        
     919 | 2025-12-29 20:13:38 |        MASTER-Tunka | (08h 14m 38.71s , +37d 47m 49.4s) |  P| |    60 | 14.4 |        
     919 | 2025-12-29 20:13:38 |        MASTER-Tunka | (08h 15m 31.64s , +37d 38m 37.7s) |  P- |    60 | 15.7 |        
     983 | 2025-12-29 20:14:41 |        MASTER-Tunka | (08h 15m 31.63s , +37d 38m 36.0s) |  P- |    60 | 15.7 |        
     983 | 2025-12-29 20:14:41 |        MASTER-Tunka | (08h 14m 38.72s , +37d 47m 38.4s) |  P| |    60 | 14.0 |        
    1050 | 2025-12-29 20:15:49 |        MASTER-Tunka | (08h 15m 31.60s , +37d 38m 34.3s) |  P- |    60 | 15.7 |        
    1050 | 2025-12-29 20:15:49 |        MASTER-Tunka | (08h 14m 38.88s , +37d 47m 44.8s) |  P| |    60 | 14.4 |        
    1114 | 2025-12-29 20:16:52 |        MASTER-Tunka | (08h 15m 31.84s , +37d 38m 36.2s) |  P- |    60 | 15.0 |        
    1114 | 2025-12-29 20:16:52 |        MASTER-Tunka | (08h 14m 38.84s , +37d 47m 29.7s) |  P| |    60 | 14.0 |        
    1177 | 2025-12-29 20:17:56 |        MASTER-Tunka | (08h 15m 31.72s , +37d 38m 31.1s) |  P- |    60 | 15.9 |        
    1177 | 2025-12-29 20:17:56 |        MASTER-Tunka | (08h 14m 38.85s , +37d 47m 27.3s) |  P| |    60 | 14.0 |        
    1240 | 2025-12-29 20:18:59 |        MASTER-Tunka | (08h 14m 39.62s , +37d 47m 47.2s) |  P| |    60 | 14.3 |        
    1240 | 2025-12-29 20:18:59 |        MASTER-Tunka | (08h 15m 32.02s , +37d 38m 31.4s) |  P- |    60 | 15.2 |        
    1304 | 2025-12-29 20:20:02 |        MASTER-Tunka | (08h 15m 31.81s , +37d 38m 27.8s) |  P- |    60 | 15.9 |        
    1367 | 2025-12-29 20:21:06 |        MASTER-Tunka | (08h 15m 32.10s , +37d 38m 28.0s) |  P- |    60 | 15.4 |        
    1367 | 2025-12-29 20:21:06 |        MASTER-Tunka | (08h 14m 39.08s , +37d 47m 30.2s) |  P| |    60 | 14.6 |        
    1431 | 2025-12-29 20:22:09 |        MASTER-Tunka | (08h 14m 38.88s , +37d 47m 07.2s) |  P| |    60 | 14.4 |        
    1431 | 2025-12-29 20:22:09 |        MASTER-Tunka | (08h 15m 31.88s , +37d 38m 24.7s) |  P- |    60 | 15.7 |        
    1494 | 2025-12-29 20:23:13 |        MASTER-Tunka | (08h 15m 32.16s , +37d 38m 24.7s) |  P- |    60 | 15.1 |        
    1494 | 2025-12-29 20:23:13 |        MASTER-Tunka | (08h 14m 39.04s , +37d 47m 20.0s) |  P| |    60 | 13.9 |        
    1558 | 2025-12-29 20:24:16 |        MASTER-Tunka | (08h 15m 32.26s , +37d 38m 21.8s) |  P- |    60 | 15.3 |        

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

View this GCN Circular online at https://gcn.nasa.gov/circulars/43254.
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