GCN Circular 45595
Subject
GRB 260914A: Mondy and TShAO optical observations
Event
Date
2026-09-16T16:00:26Z (a day ago)
From
Alina Volnova at IKI RAS <alinusss@gmail.com>
Via
Web form
A. Volnova (IKI), E. Klunko (ISTP), I. Reva (FAI), A. Pozanenko (IKI), A. Moskvitin (SAO RAS), N. Pankov (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of the GRB 260914A detected by SVOM/ECLAIR (Wang et al., GCN 45562) and Fermi/GBM (Hamburg, GCN 45569) at z = 0.778 (Saccardi et al., GCN 45579) with the AZT-33IK 1.5m telescope of the Sayan Solar Observatory (Mondy), and the Zeiss-1000 1m telescope of the Tien-Shan Observatory (TSHAO) taking several frames in R-band. The observations at Mondy started on Sep. 14 (UT) 14:51:19 (i.e., ~3.5h after the trigger), followed by the observations at TShAO starting on Sep. 14 (UT) 19:06:53 (i.e., ~8h after the trigger).
The optical/NIR counterpart (Akl et al., GCN 45564; Palmerio et al., GCN 45565; Li et al., GCN 45566; Shi et al., GCN 45567; Saccardi et al., GCN 45568; Saccardi et al., GCN 45579; Yang et al., GCN 45582; Brivio et al., GCN 45583) is detected in the stacked frames of both observatories.
The photometry and observational details are the following:
Date UT start t-T0 Exp, Filter Obj Err UL Site/Telescope
(mid,days) (n*s) (3sigma)
2026-09-14 14:51:19 0.17348 18*120 R 21.14 0.08 22.4 Mondy/AZT-33IK
2026-09-14 19:06:53 0.37395 68*90 R 21.29 0.19 22.1 TShAO/Z1000
The preliminary photometry (Vega) is based on nearby PS1 stars (Lupton 2005 transformation) and not corrected for the Galactic extinction.
The photometry of the source is affected by the underlying host galaxy reported by Saccardi et al. (GCN 45579) with Legacy survey magnitudes g=22.91, r=22.08, z=21.39.