TITLE: GCN CIRCULAR NUMBER: 38383 SUBJECT: GRB 241128A: Mondy optical observations DATE: 24/11/29 16:03:19 GMT FROM: XXXX at IKI alex@cgrsmx.iki.rssi.ru

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

We observed the field of GRB 241128A (Brivio et al., GCN 38367; Page, GCN 38368) with AZT-33IK telescope of Mondy observatory in R-filter on 2024-11-29 starting (UT) 10:48:37. We detect the afterglow (Hu et al., GCN 38371; Izzo and Malesani, GCN 38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382).

Preliminary photometry of the afterglow is the following

Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) (mid, days) (s) 2024-11-29 10:48:37 0.79796 15x120 R 19.80 0.10 22.9

The photometry is based on nearby USNO-B1.0 R2 stars.

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