GCN Circular 46201

D.Buckley (SAAO),

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)

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)

O.Gress, N.Budnev(ISU)


MASTER-SAAO robotic telescope  [1]  located in South Africa (South African Astronomical Observatory) was pointed to the SVOM GRB261108.99 (trigger No 1794181949,11h 23m 23.88s , -77d 29m 13.2s, R=0.1729) errorbox  32 sec after notice time and 2473 sec after trigger time at 2026-11-09 00:33:41 UT, with upper limit up to  17.7 mag. The observations began at zenith distance = 59 deg. The sun  altitude  is -31.3 deg. 

MASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the SVOM GRB261108.99 errorbox  58 sec after notice time and 2498 sec after trigger time at 2026-11-09 00:34:07 UT, with upper limit up to  18.7 mag. The observations began at zenith distance = 71 deg. The sun  altitude  is -17.4 deg. 

The galactic latitude b = -16 deg., longitude l = 298 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=3532441

We obtain a following upper limits.  

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

    2503 | 2026-11-09 00:33:41 |         MASTER-SAAO | (11h 16m 16.42s , -77d 18m 35.9s) |  P/ |    60 | 17.7 |        
    2503 | 2026-11-09 00:33:41 |         MASTER-SAAO | (11h 24m 58.98s , -77d 33m 54.9s) |  P\ |    60 | 17.6 |        
    2529 | 2026-11-09 00:34:07 |         MASTER-OAFA | (11h 24m 29.81s , -77d 26m 22.2s) |   C |    60 | 18.6 |        
    2582 | 2026-11-09 00:35:00 |         MASTER-SAAO | (11h 16m 16.06s , -77d 18m 37.0s) |  P/ |    60 | 17.7 |        
    2582 | 2026-11-09 00:35:00 |         MASTER-SAAO | (11h 24m 58.72s , -77d 33m 53.6s) |  P\ |    60 | 17.5 |        
    2595 | 2026-11-09 00:35:13 |         MASTER-OAFA | (11h 24m 29.37s , -77d 26m 23.4s) |   C |    60 | 18.6 |        
    2660 | 2026-11-09 00:36:19 |         MASTER-OAFA | (11h 24m 28.86s , -77d 26m 24.7s) |   C |    60 | 18.7 |        
    2661 | 2026-11-09 00:36:20 |         MASTER-SAAO | (11h 16m 15.79s , -77d 18m 38.0s) |  P/ |    60 | 17.7 |        
    2661 | 2026-11-09 00:36:20 |         MASTER-SAAO | (11h 24m 58.43s , -77d 33m 53.9s) |  P\ |    60 | 17.6 |        
    2741 | 2026-11-09 00:37:39 |         MASTER-SAAO | (11h 16m 15.36s , -77d 18m 38.6s) |  P/ |    60 | 17.7 |        
    2741 | 2026-11-09 00:37:39 |         MASTER-SAAO | (11h 24m 57.95s , -77d 33m 54.4s) |  P\ |    60 | 17.5 |        
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