GCN Circular 43670
Subject
GRB 260131A/B: continued Mondy optical observations
Event
Date
2026-02-09T15:13:09Z (a day ago)
From
Alina Volnova at IKI RAS <alinusss@gmail.com>
Via
email
A. Volnova (IKI), E. Klunko (ISTP), N. Pankov (IKI), A. Pozanenko (IKI)
report on behalf of IKI-GRB-FuN:
We continued observations of the field of GRB 260131A/B (Fermi GBM Team,
GCN 43579; Sugai et al., GCN 43580; Roberts et al., GCN 43585; Frederiks et
al., GCN 43590; Luo et al., GCN 43591; Jiang et al., GCN 43600; Li et al.,
GCN 43605) with the AZT-33IK 1.5m telescope of the Mondy observatory on
Feb. 8 starting at 13:03:46 UT and taking several frames in R band. The
optical counterpart reported by Gompertz et al., GCN 43586; Lee et al., GCN
43587; Saccardi et al., GCN 43595; García García et al., GCN 43599, Shi et
al., GCN 43601; Sanchez-Ramirez et al., GCN 43604; Jayaraman et al., GCN
43606; Zhu et al., GCN 43607; Zheng et al., GCN 43609; Adami et al., GCN
43610; Volnova et al., GCN 43632 is detected in the stacked frame.
Preliminary photometry and observational details are the following:
Date UT start t-T0 Exp. Filter Obj. Err. UL
Site/Telescope
(mid,days) (n*s) (3sigma)
2026-02-08 13:03:46 8.30854 56*120 R 21.70 0.09 22.8
Mondy/AZT-33IK
The photometry is based on several nearby stars from the USNO-B1 catalogue
(R2 magnitudes) and is not corrected for the Galactic extinction.