TITLE:   GCN CIRCULAR
NUMBER:  37912
SUBJECT: GRB 241025A: Mondy optical observations
DATE:    24/10/27 15:31:29 GMT
FROM:    Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>

 N. Pankov (HSE), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI)
report on behalf of GRB IKI FuN:

We observed the field of Swift GRB 241025A (Ambrosi et al. GCN 37859) with
AZT-33IK telescope of Mondy observatory in R-filter on 2024-10-26 starting
(UT) 17:13:51. We detect optical afterglow (Ambrosi et al., GCN 37859;
Jiang et al., GCN 37862; Pereyra et al., GCN 37865; Xu et al., GCN 37866;
SVOM/VT team, GCN 37871; Abdi et al., GCN 37882; Watson et al., GCN 37889;
Mohan et al., GCN 37890; Vinko et al., GCN 37891; Gupta et al., GCN 37893).
Preliminary photometry of first images is the following

Date UT start t-T0 Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)

2024-10-26 17:13:51 1.66876 26x120 R 21.7 0.2 22.8

The photometry is based on nearby USNO-B1.0 stars.