GCN Circular 46042
Subject
SVOM GRB261026.26: Global MASTER-Net observations report
Event
Date
2026-10-26T11:14:25Z (6 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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) was pointed to the SVOM GRB261026.26 (trigger No 1792994968,22h 29m 19.54s , +27d 02m 54.6s, R=0.1204) errorbox 16660 sec after notice time and 16776 sec after trigger time at 2026-10-26 10:49:03 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 37 deg. The sun altitude is -9.5 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=3531813
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
16806 | 2026-10-26 10:49:03 | MASTER-Tunka | (22h 27m 20.13s , +26d 44m 26.5s) | C | 60 | 17.3 | Coadd
16806 | 2026-10-26 10:49:03 | MASTER-Tunka | (22h 27m 23.87s , +26d 51m 31.0s) | C | 60 | 17.4 |
16918 | 2026-10-26 10:50:55 | MASTER-Tunka | (22h 27m 25.27s , +26d 43m 21.2s) | C | 60 | 17.6 | Coadd
16918 | 2026-10-26 10:50:55 | MASTER-Tunka | (22h 27m 28.91s , +26d 50m 26.5s) | C | 60 | 17.6 |
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