GCN Circular 46059

O.Gress, N.Budnev(ISU)

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

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)


MASTER-Tunka robotic telescope  [1]  located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the EP Alert 261026.29 (trigger No 1792997948,22h 29m 24.84s , +27d 01m 36.5s, R=0.0293333) errorbox 13795 sec after trigger time at 2026-10-26 10:49:03 UT, with upper limit up to  19.2 mag. Observations started at twilight.  The observations began at zenith distance = 37 deg. The sun  altitude  is -9.5 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP Alert 261026.29 errorbox 63611 sec after trigger time at 2026-10-27 00:39:19 UT, with upper limit up to  18.8 mag. The observations began at zenith distance = 59 deg. The sun  altitude  is -21.1 deg. 

The galactic latitude b = -26 deg., longitude l = 88 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3531911

We obtain a following upper limits.  

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

   13826 | 2026-10-26 10:49:03 |        MASTER-Tunka | (22h 27m 20.13s , +26d 44m 26.5s) |   C |    60 | 17.3 |  Coadd 
   13826 | 2026-10-26 10:49:03 |        MASTER-Tunka | (22h 27m 23.87s , +26d 51m 31.0s) |   C |    60 | 17.4 |        
   13938 | 2026-10-26 10:50:55 |        MASTER-Tunka | (22h 27m 25.27s , +26d 43m 21.2s) |   C |    60 | 17.6 |  Coadd 
   13938 | 2026-10-26 10:50:55 |        MASTER-Tunka | (22h 27m 28.91s , +26d 50m 26.5s) |   C |    60 | 17.6 |        
   14866 | 2026-10-26 11:06:23 |        MASTER-Tunka | (22h 27m 28.80s , +26d 50m 49.4s) |   C |    60 | 17.4 |        
   14867 | 2026-10-26 11:06:25 |        MASTER-Tunka | (22h 27m 25.58s , +26d 43m 35.5s) |   C |    60 | 17.3 |  Coadd 
   14979 | 2026-10-26 11:08:17 |        MASTER-Tunka | (22h 27m 19.55s , +26d 42m 31.9s) |   C |    60 | 18.4 |  Coadd 
   14980 | 2026-10-26 11:08:17 |        MASTER-Tunka | (22h 27m 22.70s , +26d 49m 45.6s) |   C |    60 | 18.3 |        
   19989 | 2026-10-26 12:31:47 |        MASTER-Tunka | (22h 27m 21.14s , +26d 47m 33.0s) |   C |    60 | 19.1 |        
   19989 | 2026-10-26 12:31:47 |        MASTER-Tunka | (22h 27m 19.43s , +26d 40m 58.8s) |   C |    60 | 19.0 |  Coadd 
   20066 | 2026-10-26 12:33:04 |        MASTER-Tunka | (22h 27m 28.01s , +26d 46m 29.1s) |   C |    60 | 19.1 |        
   20066 | 2026-10-26 12:33:04 |        MASTER-Tunka | (22h 27m 26.22s , +26d 39m 53.9s) |   C |    60 | 19.1 |  Coadd 
   20144 | 2026-10-26 12:34:22 |        MASTER-Tunka | (22h 27m 20.80s , +26d 45m 23.4s) |   C |    60 | 17.6 |        
   20144 | 2026-10-26 12:34:22 |        MASTER-Tunka | (22h 27m 18.96s , +26d 38m 47.7s) |   C |    60 | 17.6 |  Coadd 
   20221 | 2026-10-26 12:35:38 |        MASTER-Tunka | (22h 27m 27.97s , +26d 45m 47.6s) |   C |    60 | 19.1 |        
   20221 | 2026-10-26 12:35:38 |        MASTER-Tunka | (22h 27m 26.12s , +26d 39m 12.0s) |   C |    60 | 19.1 |  Coadd 
   20312 | 2026-10-26 12:37:10 |        MASTER-Tunka | (22h 27m 24.35s , +26d 46m 59.5s) |   C |    60 | 19.1 |        
   20312 | 2026-10-26 12:37:10 |        MASTER-Tunka | (22h 27m 22.49s , +26d 40m 23.9s) |   C |    60 | 19.2 |  Coadd 
   20394 | 2026-10-26 12:38:32 |        MASTER-Tunka | (22h 27m 22.45s , +26d 38m 59.0s) |   C |    60 | 19.1 |  Coadd 
   20394 | 2026-10-26 12:38:32 |        MASTER-Tunka | (22h 27m 24.33s , +26d 45m 34.7s) |   C |    60 | 19.1 |        
   20477 | 2026-10-26 12:39:54 |        MASTER-Tunka | (22h 27m 24.59s , +26d 40m 25.9s) |   C |    60 | 19.2 |  Coadd 
   20477 | 2026-10-26 12:39:54 |        MASTER-Tunka | (22h 27m 26.45s , +26d 47m 01.6s) |   C |    60 | 19.1 |        
   20557 | 2026-10-26 12:41:14 |        MASTER-Tunka | (22h 27m 20.31s , +26d 46m 05.7s) |   C |    60 | 18.8 |        
   20557 | 2026-10-26 12:41:14 |        MASTER-Tunka | (22h 27m 18.45s , +26d 39m 30.0s) |   C |    60 | 18.8 |  Coadd 
   63641 | 2026-10-27 00:39:19 |         MASTER-OAFA | (22h 28m 52.24s , +26d 56m 02.4s) |   C |    60 | 18.8 |        
   63719 | 2026-10-27 00:40:36 |         MASTER-OAFA | (22h 28m 46.79s , +26d 55m 06.7s) |   C |    60 | 18.8 |        
   75566 | 2026-10-27 03:58:03 |         MASTER-OAFA | (22h 28m 38.87s , +26d 58m 24.2s) |   C |    60 | 17.3 |        
   75640 | 2026-10-27 03:59:18 |         MASTER-OAFA | (22h 28m 41.32s , +26d 59m 57.5s) |   C |    60 | 17.0 |        
   75716 | 2026-10-27 04:00:33 |         MASTER-OAFA | (22h 28m 35.13s , +26d 59m 07.9s) |   C |    60 | 17.1 |        
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