TITLE:   GCN CIRCULAR
NUMBER:  37891
SUBJECT: ​GRB 241025A: optical photometry from Konkoly
DATE:    24/10/26 09:55:26 GMT
FROM:    Jozsef Vinko at Konkoly Observator <vinko@konkoly.hu>

GRB 241025A: optical photometry from Konkoly 

J. Vinko, K. Sarneczky, Zs. Bora, A. Horti-David, R. Konyves-Toth, L. Kriskovics, A. Pal, R. Szakats 
(Konkoly Observatory, Hungary) 

We report detection and photometry of the optical afterglow of GRB 241025A 
(Ambrosi et al., GCN 37859; Fermi GBM team GCN 37860; Wang et al. GCN 37863) 
taken with the RC80 robotic telescope at Piszkesteto Station of Konkoly 
Observatory, Hungary. The observations started on 2024-10-25 16:48:09.79 UT, 
15.19 hours after the trigger. 7 sets of 300 sec frames were collected through. 
Sloan r'- and i' bands. 

The optical afterglow (Jiang et al. GCN 37862; Pereyra et al. GCN 37865; SVOM/VT team GCN 37871; 
Abdi et al. GCN 37882; Watson et al. GCN 37889; Mohan et al. GCN 37890) 
was detected on the stacked frames with the following magnitudes, calibrated 
via nearby PS1 stars: 

Date       UT-middle   t-T0(days) Exp(s) r'(AB)       i'(AB) 
2024-10-25 17:18:57.70 0.65425    7x300  22.04 (0.35) 20.07 (0.17) 

The magnitudes above are not corrected for galactic extinction.