GCN Circular 43036

Subject

SVOM GRB251208D: Global MASTER-Net observations report

Event

GRB 251208D

Date

2025-12-08T19:28:32Z (3 days ago)

Edited On

2025-12-08T21:52:36Z (3 days ago)

From

Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@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-Kislovodsk robotic telescope  [1]  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the SVOM GRB251208.70 (trigger No 1765212621,22h 30m 08.33s , -00d 23m 30.5s, R=0.1962) errorbox  6047 sec after notice time and 7322 sec after trigger time at 2025-12-08 18:52:23 UT, with upper limit up to  13.3 mag. The observations began at zenith distance = 73 deg. The sun  altitude  is -56.3 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) was pointed to the SVOM GRB251208.70 errorbox  7366 sec after notice time and 8641 sec after trigger time at 2025-12-08 19:14:22 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 56 deg. The sun  altitude  is -17.9 deg. 

The galactic latitude b = -47 deg., longitude l = 66 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3064681

We obtain a following upper limits.  

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

    7382 | 2025-12-08 18:52:23 |   MASTER-Kislovodsk | (22h 29m 37.06s , -00d 21m 55.6s) |   C |   120 | 12.6 |        
    7382 | 2025-12-08 18:52:23 |   MASTER-Kislovodsk | (22h 29m 37.94s , -00d 00m 13.8s) |   C |   120 | 13.2 |        
    8671 | 2025-12-08 19:14:22 |         MASTER-SAAO | (22h 28m 00.88s , -00d 37m 02.0s) |   C |    60 | 18.9 |        
    8671 | 2025-12-08 19:14:22 |         MASTER-SAAO | (22h 26m 18.28s , -00d 21m 13.1s) |   C |    60 | 18.5 |        
    8764 | 2025-12-08 19:15:54 |         MASTER-SAAO | (22h 27m 55.90s , -00d 37m 31.3s) |   C |    60 | 19.0 |        
    8764 | 2025-12-08 19:15:54 |         MASTER-SAAO | (22h 26m 13.40s , -00d 21m 40.9s) |   C |    60 | 18.6 |        
    8867 | 2025-12-08 19:17:38 |         MASTER-SAAO | (22h 26m 12.54s , -00d 20m 34.9s) |   C |    60 | 18.5 |        
    8892 | 2025-12-08 19:18:03 |   MASTER-Kislovodsk | (22h 29m 36.09s , -00d 22m 32.0s) |   C |    60 | 12.2 |        
    8892 | 2025-12-08 19:18:03 |   MASTER-Kislovodsk | (22h 29m 39.94s , -00d 01m 05.5s) |   C |    60 | 13.2 |        
    8972 | 2025-12-08 19:19:22 |   MASTER-Kislovodsk | (22h 29m 33.23s , -00d 02m 12.0s) |   C |    60 | 13.3 |        
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