GCN Circular 42599

Subject
Fermi trigger No 784034269: Global MASTER-Net observations report
Date
2025-11-06T15:31:31Z (3 days 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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB251105.47 (trigger No 784034269,15h 02m 48.00s , +00d 42m 00.0s, R=16.55) errorbox  1 days 12779 sec after notice time and 1 days 12816 sec after trigger time at 2025-11-06 14:51:20 UT, with upper limit up to  17.0 mag. Observations started at twilight.  The observations began at zenith distance = 70 deg. The sun  altitude  is -10.4 deg. 

The galactic latitude b = 48 deg., longitude l = 359 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3033526

We obtain a following upper limits.  

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

   99247 | 2025-11-06 14:51:20 |   MASTER-Kislovodsk | (16h 11m 58.94s , +05d 23m 45.3s) |   C |    60 | 15.2 |        
   99407 | 2025-11-06 14:54:00 |   MASTER-Kislovodsk | (16h 03m 48.49s , +06d 53m 43.0s) |   C |    60 | 14.6 |        
   99407 | 2025-11-06 14:54:00 |   MASTER-Kislovodsk | (15h 59m 55.31s , +07d 14m 52.2s) |   C |    60 | 16.1 |        
  100174 | 2025-11-06 15:06:48 |   MASTER-Kislovodsk | (16h 08m 18.64s , +08d 47m 14.1s) |   C |    60 | 14.9 |        
  100174 | 2025-11-06 15:06:48 |   MASTER-Kislovodsk | (16h 04m 23.51s , +09d 08m 40.4s) |   C |    60 | 17.0 |        
  100254 | 2025-11-06 15:08:08 |   MASTER-Kislovodsk | (15h 58m 15.81s , +10d 40m 34.1s) |   C |    60 | 14.9 |        
  100254 | 2025-11-06 15:08:08 |   MASTER-Kislovodsk | (15h 54m 19.73s , +11d 01m 57.5s) |   C |    60 | 17.0 |        
  101261 | 2025-11-06 15:24:55 |   MASTER-Kislovodsk | (15h 42m 43.41s , +10d 40m 23.8s) |   C |    60 | 15.0 |        
  101261 | 2025-11-06 15:24:55 |   MASTER-Kislovodsk | (15h 38m 50.98s , +11d 01m 00.9s) |   C |    60 | 16.8 |        
Filter C is a clear (unfiltred) band. 


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