TITLE: GCN CIRCULAR NUMBER: 38602 SUBJECT: GRB 241217A: GMG Optical Upper Limit DATE: 24/12/18 02:36:17 GMT FROM: Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi@ynao.ac.cn> R.-Z. Li, B.-T. Wang, F.-F. Song, J. Mao, H.-C. Feng and J.-M. Bai (YNAO, CAS) report: We observed the field of GRB 241217A (Marius et al., GCN 38594, T0 at 2024-12-17T16:57:13) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-12-17T17:30:55, about 0.56 hours after the trigger. No new uncataloged optical source was detected within the SVOM/VT error circle (GCN 38600). The preliminary analysis results are shown as follows: +----------------+------------+----------+----------------+ | Tmid-T0 [hr] | Exp. [s] | Filter | 5-sigma U.L. | +================+============+==========+================+ | 0.65 | 600 | r | 20.6 | +----------------+------------+----------+----------------+ The given magnitudes are derived based on calibrating against Pan-STARRS1 field stars. View this GCN Circular online at https://gcn.nasa.gov/circulars/38602. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...