GCN Circular 46228
Subject
GRB 261110A: CrAO ZTSh optical observations
Event
Date
2026-11-11T17:26:22Z (4 hours ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
email
A. Moskvitin (SAO), V. Rumyantsev (CrAO), A. Pozanenko (IKI),
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 SVOM GRB 261110A (Wang et al., GCN 46215)
with the Shajn 2.6-meter telescope (ZTSh) of the Crimean Astrophysical
Observatory (CrAO) on November 10 and obtained two series in R band
(t_mid - T0 = 6.12 and 10.81 hours respectively).
The afterglow (Wu et al., GCN 46218; Li et al., GCN 46219; Moskvitin
et al., GCN 46220; Angulo et al., GCN 46223) is clearly detected
in stacked images of the two epochs with the following parameters.
Date UT start t-T0 Exp, Filter Obj Err UL
(mid, d) (n*s) (3sigma)
2026-11-10 17:51:58 0.25498 5*120 R 22.30 +/- 0.10 23.7
2026-11-10 21:43:16 0.45050 53*120 R 22.80 +/- 0.09 24.3
The photometry (Vega) is preliminary and based on nearby SDSS stars
(Lupton 2005 transformation) and not corrected for Galactic extinction.