GCN Circular 42694

Subject
Fermi GRB 251115A: Global MASTER-Net observations report
Event
GRB 251115A
Date
2025-11-15T04:30:41Z (5 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-OAFA robotic telescope  [1]  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 251115A ( Fermi GBM team, GCN 42692Loading...
 
 ) errorbox  41 sec after notice time and 74 sec after trigger time at 2025-11-15 03:21:17 UT, with upper limit up to  20.0 mag. The observations began at zenith distance = 64 deg. The sun  altitude  is -38.6 deg. 

The galactic latitude b = -47 deg., longitude l = 59 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3042754

We obtain a following upper limits.  

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

      80 | 2025-11-15 03:21:17 |         MASTER-OAFA | (22h 03m 35.41s , -07d 54m 09.9s) |   C |    10 | 18.6 |        
     101 | 2025-11-15 03:21:33 |         MASTER-OAFA | (22h 03m 35.36s , -07d 54m 09.6s) |   C |    20 | 19.0 |        
     141 | 2025-11-15 03:22:09 |         MASTER-OAFA | (22h 12m 15.81s , -08d 11m 40.7s) |   C |    30 | 19.4 |        
     178 | 2025-11-15 03:22:45 |         MASTER-OAFA | (22h 12m 15.80s , -08d 11m 40.4s) |   C |    30 | 19.4 |        
     219 | 2025-11-15 03:23:21 |         MASTER-OAFA | (22h 12m 15.79s , -08d 11m 40.4s) |   C |    40 | 19.5 |        
     270 | 2025-11-15 03:24:07 |         MASTER-OAFA | (22h 12m 15.78s , -08d 11m 40.0s) |   C |    50 | 19.7 |        
     331 | 2025-11-15 03:25:03 |         MASTER-OAFA | (22h 12m 15.78s , -08d 11m 40.0s) |   C |    60 | 19.8 |        
     658 | 2025-11-15 03:30:00 |         MASTER-OAFA | (22h 18m 22.95s , -04d 21m 04.4s) |   C |   120 | 20.0 |        
     794 | 2025-11-15 03:32:06 |         MASTER-OAFA | (22h 18m 22.96s , -04d 21m 04.5s) |   C |   140 | 20.0 |        
     955 | 2025-11-15 03:34:32 |         MASTER-OAFA | (22h 18m 22.96s , -04d 21m 04.4s) |   C |   170 | 20.0 |        
    1076 | 2025-11-15 03:37:28 |         MASTER-OAFA | (22h 18m 22.99s , -04d 21m 04.2s) |   C |    60 | 19.5 |        
    1141 | 2025-11-15 03:38:34 |         MASTER-OAFA | (22h 18m 23.03s , -04d 21m 04.4s) |   C |    60 | 19.5 |        
    1207 | 2025-11-15 03:39:39 |         MASTER-OAFA | (22h 18m 23.03s , -04d 21m 04.4s) |   C |    60 | 19.4 |        
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