TITLE: GCN CIRCULAR NUMBER: 38519 SUBJECT: GRB 241128A: CrAO ZTSh and Mondy AZT-33IK optical observations DATE: 24/12/10 09:57:54 GMT FROM: Nicolai Pankov at HSE, IKI RAS colinsergesen@gmail.com
A. Volnova (IKI), N. Pankov (HSE, IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO), E. Klunko (ISTP) report on behalf of IKI-GRB-FuN:
We continued observations of the GRB 241128A (Brivio et al., GCN 38367; Page, GCN 38368) with 2.6-meter ZTSh telescope of CrAO observatory and 1.5-meter AZT-33IK telescope of Sayan observatory (Mondy). The optical afterglow (Hu et al., GCN 38371; Izzo and Malesani, GCN 38372; Gompertz et al., GCN 38373; Akl et al., GCN 38382; Pankov et. al, GCN 38383, GCN 38395; Shilling & Brivio, GCN 38422; Midavaine et. al, GCN 38438) is well detected in the stacked images from ZTSh on both epochs of 2024-11-30 and 2024-12-01. Preliminary photometry is given below:
Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) Telescope (mid, days) (s) 2024-11-30 17:38:32 2.066296 11*120 R 22.03 0.14 23.1 ZTSh 2024-12-01 10:31:12 2.793500 46*120 R n/d n/d 21.9 AZT-33IK 2024-12-01 15:19:05 3.000058 48*120 R 23.12 0.11 24.0 ZTSh
The magnitudes were calibrated against nearby PS1 stars (R magnitudes obtained with Lupton transformations) and not corrected for the Galactic extinction. Using the current photometry and our photometry reported previously (Pankov et. al, GCN, 38383) we found that the light curve is well fitted with a simple power-law model with an index of -2.2.
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