GCN Circular 43568

Subject
Fermi GRB 260129A: Global MASTER-Net observations report
Event
GRB 260129A
Date
2026-01-30T09:45:35Z (19 hours 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) started inspect of the Fermi GRB 260129A ( "The Fermi GBM team, GCN 43560Loading...
 
 ) errorbox 11097 sec after trigger time at 2026-01-29 07:38:10 UT, with upper limit up to  20.3 mag. The observations began at zenith distance = 14 deg. The sun  altitude  is -26.1 deg. 

MASTER-SAAO robotic telescope  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 260129A errorbox  11436 sec after notice time and 62790 sec after trigger time at 2026-01-29 21:59:43 UT, with upper limit up to  18.7 mag. The observations began at zenith distance = 29 deg. The sun  altitude  is -38.6 deg. 

The galactic latitude b = 10 deg., longitude l = 281 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3118323

We obtain a following upper limits.  

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

   11158 | 2026-01-29 07:38:10 |         MASTER-OAFA | (11h 27m 13.34s , -44d 41m 02.7s) |   C |   120 | 20.3 |        
   11292 | 2026-01-29 07:40:24 |         MASTER-OAFA | (11h 27m 07.54s , -44d 41m 59.8s) |   C |   120 | 20.3 |        
   11428 | 2026-01-29 07:42:41 |         MASTER-OAFA | (11h 27m 15.05s , -44d 41m 35.1s) |   C |   120 | 20.3 |        
   62821 | 2026-01-29 21:59:43 |         MASTER-SAAO | (10h 11m 50.86s , -45d 52m 29.4s) |   C |    60 | 18.4 |        
   62821 | 2026-01-29 21:59:43 |         MASTER-SAAO | (10h 14m 26.54s , -46d 07m 36.2s) |   C |    60 | 18.5 |        
   63446 | 2026-01-29 22:10:08 |         MASTER-SAAO | (10h 11m 53.44s , -45d 51m 31.8s) |   C |    60 | 18.5 |        
   63446 | 2026-01-29 22:10:08 |         MASTER-SAAO | (10h 14m 29.91s , -46d 06m 40.7s) |   C |    60 | 18.5 |        
   63538 | 2026-01-29 22:11:41 |         MASTER-SAAO | (10h 23m 16.96s , -45d 52m 29.2s) |   C |    60 | 18.5 |        
   63538 | 2026-01-29 22:11:41 |         MASTER-SAAO | (10h 25m 53.45s , -46d 07m 38.5s) |   C |    60 | 18.7 |        
   69831 | 2026-01-29 23:56:34 |         MASTER-SAAO | (10h 11m 31.47s , -45d 50m 19.4s) |   C |    60 | 18.5 |        
   69831 | 2026-01-29 23:56:34 |         MASTER-SAAO | (10h 14m 12.48s , -46d 05m 44.3s) |   C |    60 | 18.6 |        
   69924 | 2026-01-29 23:58:06 |         MASTER-SAAO | (10h 23m 08.92s , -45d 50m 23.0s) |   C |    60 | 18.5 |        
   69924 | 2026-01-29 23:58:06 |         MASTER-SAAO | (10h 25m 49.94s , -46d 05m 48.7s) |   C |    60 | 18.7 |        
   71379 | 2026-01-30 00:22:22 |         MASTER-SAAO | (11h 35m 50.59s , -53d 50m 24.1s) |   C |    60 | 18.4 |        
   72378 | 2026-01-30 00:39:01 |         MASTER-SAAO | (11h 35m 50.52s , -53d 49m 57.6s) |   C |    60 | 18.4 |        
   97583 | 2026-01-30 07:39:05 |             MASTER- | (11h 14m 18.98s , -40d 12m 46.3s) |   C |    60 | 12.5 |        
   98173 | 2026-01-30 07:48:55 |             MASTER- | (10h 28m 29.18s , -38d 41m 20.6s) |   C |    60 | 17.5 |        
   98173 | 2026-01-30 07:48:55 |             MASTER- | (10h 29m 56.16s , -39d 15m 37.1s) |   C |    60 | 17.8 |        
   98242 | 2026-01-30 07:50:04 |             MASTER- | (10h 39m 15.98s , -39d 16m 29.4s) |   C |    60 | 17.7 |        
   98242 | 2026-01-30 07:50:04 |             MASTER- | (10h 37m 49.29s , -38d 42m 11.6s) |   C |    60 | 17.4 |        
   98312 | 2026-01-30 07:51:14 |             MASTER- | (10h 49m 27.34s , -39d 17m 20.5s) |   C |    60 | 16.0 |        
   98312 | 2026-01-30 07:51:14 |             MASTER- | (10h 48m 02.65s , -38d 43m 01.0s) |   C |    60 | 16.9 |        
   98384 | 2026-01-30 07:52:26 |             MASTER- | (10h 13m 19.68s , -40d 15m 49.2s) |   C |    60 | 14.8 |        
   98384 | 2026-01-30 07:52:26 |             MASTER- | (10h 14m 48.12s , -40d 50m 02.2s) |   C |    60 | 14.8 |        
   98453 | 2026-01-30 07:53:36 |             MASTER- | (10h 16m 32.79s , -40d 50m 27.7s) |   C |    60 | 13.0 |        
   98453 | 2026-01-30 07:53:36 |             MASTER- | (10h 14m 46.66s , -40d 16m 18.6s) |   C |    60 | 12.3 |        
   98524 | 2026-01-30 07:54:47 |             MASTER- | (10h 41m 57.54s , -37d 23m 14.9s) |   C |    60 | 18.1 |        
   98524 | 2026-01-30 07:54:47 |             MASTER- | (10h 40m 33.59s , -36d 49m 02.8s) |   C |    60 | 17.6 |        
   98594 | 2026-01-30 07:55:56 |             MASTER- | (10h 51m 59.28s , -37d 21m 24.5s) |   C |    60 | 18.0 |        
   98594 | 2026-01-30 07:55:56 |             MASTER- | (10h 50m 35.55s , -36d 47m 11.0s) |   C |    60 | 17.7 |        
   98666 | 2026-01-30 07:57:08 |             MASTER- | (10h 15m 39.98s , -40d 15m 20.6s) |   C |    60 | 12.3 |        
   98806 | 2026-01-30 07:59:28 |             MASTER- | (10h 27m 25.44s , -40d 50m 52.5s) |   C |    60 | 15.6 |        
   98806 | 2026-01-30 07:59:28 |             MASTER- | (10h 25m 56.82s , -40d 16m 28.3s) |   C |    60 | 15.6 |        
   98950 | 2026-01-30 08:01:52 |             MASTER- | (10h 28m 26.76s , -38d 43m 31.6s) |   C |    60 | 17.8 |        
   98950 | 2026-01-30 08:01:52 |             MASTER- | (10h 29m 53.21s , -39d 17m 54.3s) |   C |    60 | 17.9 |        
   99020 | 2026-01-30 08:03:02 |             MASTER- | (10h 39m 13.65s , -39d 17m 26.4s) |   C |    60 | 17.9 |        
   99020 | 2026-01-30 08:03:02 |             MASTER- | (10h 37m 47.28s , -38d 43m 02.2s) |   C |    60 | 17.7 |        
   99090 | 2026-01-30 08:04:12 |             MASTER- | (10h 47m 58.95s , -38d 41m 25.0s) |   C |    60 | 17.5 |        
   99090 | 2026-01-30 08:04:12 |             MASTER- | (10h 49m 25.13s , -39d 15m 51.5s) |   C |    60 | 17.8 |        
   99162 | 2026-01-30 08:05:24 |             MASTER- | (10h 13m 13.05s , -40d 17m 55.1s) |   C |    60 | 14.9 |        
   99162 | 2026-01-30 08:05:24 |             MASTER- | (10h 14m 41.45s , -40d 52m 16.3s) |   C |    60 | 14.8 |        
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