TITLE:   GCN CIRCULAR
NUMBER:  46220
SUBJECT: GRB 261110A: SAO RAS optical observations
DATE:    26/11/10 23:00:13 GMT
FROM:    Alexander Moskvitin at SAO RAS <mosk@sao.ru>

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

We observed the field of the SVOM GRB 261110A (Wang et al., GCN 46215)
with the Zeiss-1000, 1-m telescope of SAO RAS on November 10,
19:54:00--21:00:26 UT (t_mid - T0 = 8.62 hours after the trigger).

The OT (Wu et al., GCN 46218; Li et al., GCN 46219) is detected
in our stacked frame with the following brightness.

Date       UT start  t-T0     Exp,    Filter Obj      Err   UL
                     (mid, d) (n*s)                         (3sigma)
2026-11-10 19:54:00  0.35918  12*300  Rc     23.0 +/- 0.2   23.6

This preliminary photometry (Vega) is based on nearby SDSS stars
(Lupton 2005 transformation) and not corrected for Galactic
extinction.


_____________________________________________
Alexander Sergeevich Moskvitin, Ph. D., researcher,
Optical Transient Physics Laboratory (#523), SAO RAS,
369167, Nizhnij Arkhyz, Karachai-Cherkessia, Russia,
+7(928)3946958, mosk@sao.ru