TITLE: GCN CIRCULAR NUMBER: 39192 SUBJECT: GRB 250129A: Continued AbAO and Mondy optical observations DATE: 25/02/07 06:03:52 GMT FROM: Nicolai Pankov at HSE, IKI RAS colinsergesen@gmail.com
N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), R. Ya. Inasaridze (AbAO) report on behalf of the IKI-GRB-FuN collaboration:
We continued optical observations of the field of GRB 250129A (Beardmore et. al, GCN 39066; Lipunov et. al, GCN 39070; Schneider et. al, GCN 39071; Belkin et. al, GCN 39072; Izzo et. al, GCN 39073; Izzo et. al, GCN 39074; Ghosh et. al, GCN 39077; Schneider et. al, GCN 39078; Brivio et. al, GCN 39079; Goad et. al, GCN 39082; Siegel, GCN 39085; Osborne et. al, GCN 39089; Zheng et. al, GCN 39090; Schlekat et. al, GCN 39091; Antier et. al, GCN 39096; Odeh et. al, GCN 39097; Ferro et. al, GCN 39098; Malesani et. al, GCN 39100; Romanov, GCN 39101; Zheng et. al, GCN 39102; Watson et. al, GCN 39104; Watson et. al, GCN 39105; Akl et. al, GCN 39106; Moskvitin et. al, GCN 39107; Calapai et. al, GCN 39109; Schlekat et. al, GCN 39110; Gompertz et. al, GCN 39114; Ror et. al, GCN 39115; Frederiks et. al, GCN 39116; Wu et. al, GCN 39124; Paek et. al, GCN 39129; Moskvitin et. al, GCN 39130; Bochenek et. al, GCN 39131; Watson et. al, GCN 39136; Pankov et. al, GCN 39139; Pérez-Fournon et. al, GCN 39140; Markwardt et. al, GCN 39147) in the R filter with the 1.5-meter AZT-33IK telescope of the Sayan Solar Observatory (Mondy) and the 0.7-meter AS-32 telescope of the Abastumani Observatory (AbAO). The observations began at Mondy on 2025-02-02 at 19:46:28 UT, i.e. ~4.65 days since trigger. Using optimal image subtraction against PS1 template with apex_subtract pipeline, we detect the optical counterpart in the stacked image from Mondy, while obtaining an upper limit at AbAO. The preliminary photometry is as follows:
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) Telescope (mid, days) (s) 2025-02-02 19:46:28 4.65439 41*120 R 21.63 0.18 23.1 AZT-33IK 2025-02-02 22:26:20 4.76923 93*60 R n/d n/d 21.8 AS-32
The photometry is based on nearby stars of the USNO-B1.0 catalog (R2 magnitudes) and has not been corrected for the Galactic extinction.
View this GCN Circular online at https://gcn.nasa.gov/circulars/39192. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...