GCN Circular 46110
Subject
GRB 261026A: Mondy, SAO RAS and Terskol optical observations
Event
Date
2026-10-30T13:09:20Z (2 days ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
email
A. Moskvitin (SAO), O. Spiridonova (SAO), E. Klunko (ISTP), D. Andreev
(INASAN),
I. Sokolov (INASAN), A. Volnova (IKI), N. Pankov (IKI), A. Pozanenko (IKI),
on behalf of the SAO GRB follow-up team and the IKI-GRB-FuN report.
We observed the field of GRB 261026A discovered by SVOM (Goto et al., GCN
46030;
Xie et al., GCN 46068), also detected by EP-FXT (Jiang et al., GCN 46058)
with AZT-33IK 1.5-m telescope of the Sayan Solar Observatory (Mondy)
1-m Zeiss-1000 telescope of SAO RAS and 2-m Zeiss-2000 telescope
of the Terskol Observatory (INASAN).
The OT (Dornic et al., GCN 46033; Zheng et al., GCN 46034; Wu et al., GCN
46035;
Li et al., GCN 46046; Morín-González et al., GCN 46048; Coyo et al., GCN
46054;
Moskvitin et al., GCN 46062; Li et al., GCN 46063; also observed in NIR:
Mohan et al., GCN 46041; Shi et al., GCN 46047; Manyan et al., GCN 46064)
is detected in our stacked frames. Details of the observation are the
following.
Date UT start t-T0 Exp, Filter Obj Err UL
Obs./Tel.
(mid,days) (n*s) (3sigma)
2026-10-27 13:27:57 1.37418 36*120 R 21.8 +/- 0.2 22.5
Mondy/AZT-33IK
2026-10-27 17:03:29 1.48441 36*100 Rc 22.0 +/- 0.2 22.6
SAO/Zeiss-1000
2026-10-28 19:20:41 2.58316 40*100 Rc 22.7 +/- 0.3 22.7
SAO/Zeiss-1000
2026-10-28 20:37:22 2.62112 17*180 R 23.0 +/- 0.3 23.1
Terskol/Zeiss-2000
This preliminary photometry (Vega) is based on nearby SDSS stars
(Lupton 2005 transformation) and not corrected for Galactic extinction.