GCN Circular 42870
Subject
GRB 251126A: further SAO RAS optical observations
Event
Date
2025-11-28T12:46:09Z (10 months ago)
From
Alexander Moskvitin at SAO RAS <mosk@sao.ru>
Via
Web form
A. Moskvitin (SAO RAS), V. Goranskij (SAI MSU, SAO RAS),
V. S. Shergin (SAO RAS), A. A. Volnova (IKI), A. S. Pozanenko (IKI)
report on behalf of IKI-GRB-FuN and GRB follow-up team.
We observed the field of the Swift GRB 251126A (Caputo et al.,
GCN 42843; Evans, GCN 42845; Goad et al., GCN 42851; Page et al.,
GCN 42860) with the Zeiss-1000 1m telescope of the SAO RAS
on November 27/28 night. We obtained two series of 300 sec. images
in Rc band under a good weather conditions and seeing (FWHM) ~1".5.
The optical afterglow (Swain, GCN 42844; Fu et al., GCN 42848;
Reguitti et al., GCN 42849; Broens et al., GCN 42850; Anguloet al.,
GCN 42855; Pulido-Torres et al; GCN 42856; Gupta et al., GCN 42857;
Cotter et al., GCN 42858; Seki et al., GCN 42859; Volnova et al.,
GCN 42861; Breeveld and Caputo, GCN 42863; Gupta et al., GCN 42864;
Burkhonov et al., GCN 42866; Maksut et al., GCN 42868) is clearly
detected in the stacked frames. The preliminary results are as
following.
Date UT start t-T0 Exp. Filter OT Err. UL
(mid,days) (n*s) (3sigma)
2025-11-27 20:20:22 1.07076 11*300 Rc 22.02 0.04 24.1
2025-11-27 23:31:00 1.19809 8*300 Rc 22.24 0.07 23.8
The photometry is based on nearby stars from the USNO-B1 catalogue
(R2 magnitudes)and is not corrected for the Galactic extinction.