TITLE:   GCN CIRCULAR
NUMBER:  46279
SUBJECT: GRB 261113A: AZT-20 Assy-Turgen optical observations
DATE:    26/11/14 23:48:24 GMT
FROM:    Alexander Moskvitin at SAO RAS <mosk@sao.ru>

A. Moskvitin (SAO), A. Pozanenko (IKI), M. Krugov (FAI),  A. Volnova (IKI),
N. Pankov (IKI), O. Spiridonova (SAO) report on behalf of IKI-GRB-FuN
and SAO GRB follow-up team.

We observed the field of the GRB 261113A (Saccardi et al., GCN 46244;
Frederiks et al., GCN 46268; Dagoneau et al., GCN 46270)
at the redshift of z = 3.580 (Saccardi et al., GCN 46261;
Perez-Garcia et al., GCN 46264) with the 1.5-m AZT-20 telescope
of the Assy-Turgen Observatory on 2026-11-14T13:09:44--
2026-11-14T14:15:32 UT (t_mid - T0 = 0.96639 days).

The OT (Lei et al., GCN 46248; Li et al., GCN 46249; Yin et al.,
GCN 46250; Chen et al., GCN 46251; Wu et al., GCN 46252; Zhao et al.,
GCN 46253; Li et al., GCN 46254; Saikia et al., GCN 46256; Adami et al.,
GCN 46257; Gress et al., GCN 46258; Izzo et al., GCN 46259; Saccardi et
al., GCN 46261; Maksut et al., GCN 46262; Moskvitin et al., GCN 46263;
Perez-Garcia et al., GCN 46264; de Ugarte Postigo et al., GCN 46265;
Dimple et al., GCN 46266; Jelinek et al., GCN 46271; Wei et al.,
GCN 46274; also observed in NIR: Lin et al., GCN 46247; Brivio et al.,
GCN 46260) is clearly detected in our stacked image.
The results are as follows.

Date       UT start t-T0    Exp,  Filter Obj       Err  UL
                    (mid,h) (n*s)                       (3sigma)
2026-11-14 13:09:44 23.1933 58*60 r-SDSS 23.26 +/- 0.12 24.4

The photometry was calibrated against nearby SDSS stars and
not corrected for Galactic extinction.