GCN Circular 38709
Subject
GRB 241228A: Mondy optical afterglow observations
Date
2024-12-29T16:43:08Z (4 days ago)
From
Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>
Via
email
A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (HSE)
report on behalf of GRB IKI FuN:
We observed the field of GRB 241228B triggered by Fermi (Fermi GBM team,
GCN 38682) with AZT-33IK telescope of Mondy observatory in R-filter
starting on (UT) 2024-12-28 19:42:31. We clearly detect optical afterglow
(Kumar et al., GCN 38684 and GCN 38691; An et al. GCN 38687; Ortega-Casas
et al., GCN 38692; Ghosh et al., GCN 38702; An et al., GCN 38704).
Preliminary photometry of the afterglow is the following
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma)
(mid, days) (s)
2024-12-28 19:42:31 0.66628 30x120 R 20.28 0.04 23.0
The photometry is based on nearby SDSS DR16 stars (R mags by Lupton
transformation).