GCN Circular 46192

Subject
Fermi trigger No 815809059: Global MASTER-Net observations report
Date
2026-11-08T11:31:37Z (4 hours ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
O.Gress, N.Budnev(ISU)

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 (Lomonosov MSU)

D.Buckley (SAAO),

A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
A.Sosnovskij (Lomonosov MSU)

A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)

R.Rebolo (The Instituto de Astrofisica de Canarias)

M. Segura,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA)


MASTER-Tunka robotic telescope  [1]  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB261108.23 (trigger No 815809059,16h 21m 43.92s , +73d 12m 00.0s, R=8.8) errorbox  18073 sec after notice time and 18108 sec after trigger time at 2026-11-08 10:39:23 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 36 deg. The sun  altitude  is -11.3 deg. 

The galactic latitude b = 36 deg., longitude l = 106 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3532423

We obtain a following upper limits.  

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

   18138 | 2026-11-08 10:39:23 |        MASTER-Tunka | (15h 58m 47.65s , +78d 54m 47.6s) |   C |    60 | 16.8 |        
   18138 | 2026-11-08 10:39:23 |        MASTER-Tunka | (15h 58m 48.10s , +79d 02m 41.9s) |   C |    60 | 17.0 |  Coadd 
   18238 | 2026-11-08 10:41:02 |        MASTER-Tunka | (16h 44m 46.07s , +71d 15m 10.0s) |   C |    60 | 17.8 |        
   18238 | 2026-11-08 10:41:02 |        MASTER-Tunka | (16h 44m 52.82s , +71d 07m 49.0s) |   C |    60 | 18.0 |  Coadd 
   18320 | 2026-11-08 10:42:24 |        MASTER-Tunka | (16h 44m 44.99s , +71d 17m 02.1s) |   C |    60 | 17.4 |        
   18320 | 2026-11-08 10:42:24 |        MASTER-Tunka | (16h 44m 51.00s , +71d 09m 40.3s) |   C |    60 | 17.6 |  Coadd 
   18398 | 2026-11-08 10:43:43 |        MASTER-Tunka | (16h 49m 55.32s , +73d 01m 12.6s) |   C |    60 | 17.9 |  Coadd 
   18399 | 2026-11-08 10:43:43 |        MASTER-Tunka | (16h 49m 48.62s , +73d 08m 34.6s) |   C |    60 | 17.7 |        
   18493 | 2026-11-08 10:45:17 |        MASTER-Tunka | (16h 49m 51.87s , +73d 09m 50.4s) |   C |    60 | 17.6 |        
   18493 | 2026-11-08 10:45:17 |        MASTER-Tunka | (16h 49m 58.39s , +73d 02m 27.9s) |   C |    60 | 17.7 |        
   18616 | 2026-11-08 10:47:21 |        MASTER-Tunka | (16h 49m 52.85s , +73d 09m 15.5s) |   C |    60 | 14.3 |        
   18616 | 2026-11-08 10:47:21 |        MASTER-Tunka | (16h 49m 58.22s , +73d 01m 52.7s) |   C |    60 | 14.2 |        
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
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