TITLE:   GCN CIRCULAR
NUMBER:  42944
SUBJECT: GRB 251126A: SAO RAS optical marginal detection
DATE:    25/12/02 12:05:32 GMT
FROM:    Alexander Moskvitin at SAO RAS <mosk@sao.ru>



A. Moskvitin, O. Spiridonova, V. Shergin (SAO RAS), 
A. Volnova (IKI), N. Pankov (HSE, IKI), A. 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; Barthelmy et al., GCN 42876) with the Zeiss-1000 
1m telescope of the SAO RAS starting on 2025-11-30 (UT) 00:19:43.

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; 
Moskvitin et al, GCN 42870; Adami et al., GCN 42871; Pankov et al., 
GCN 42875; Goranskij et al., GCN 42896; Yao et al., GCN 42941) 
is marginally detected in the stacked frame with the following
brightness.

Date        UT start  t-T0       Exp.    Filter  OT     Err.  UL      
                     (mid,days)  (n*s)                       (3sigma) 
                     
2025-11-30  00:19:43  3.24019    13*300  Rc      24.3   0.4   24.3  

The preliminary photometry is based on nearby stars from the USNO-B1 
catalogue (R2 magnitudes) and is not corrected for the Galactic 
extinction.