TITLE: GCN CIRCULAR NUMBER: 35349 SUBJECT: GRB 231215A: Mondy optical bright afterglow detection DATE: 23/12/15 12:55:34 GMT FROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru> N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN: We observed the field of Swift GRB 231215A (D'Avanzo et al., GCN 35343; Evans et al., GCN 35345) with AZT-33IK telescope of Mondy observatory in R-filter starting on 2023-12-15 (UT) 11:17:39. Preliminary photometry of the fist immaes reveals a new bright source within XRT error circle (Evans et al., GCN 35345) Date UT start t-T0 Exp. Filter OT Err. (mid, days) (s) 2023-12-15 11:17:39 0.063363 1x120 R 17.42 0.07 The photometry is based on nearby USNO-B1.0 R2 stars. We also may suggest that GCN 35347 (Lipunov et al.) refer to the afterglow of GRB 231215A. View this GCN Circular online at https://gcn.nasa.gov/circulars/35349. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...