TITLE: GCN CIRCULAR NUMBER: 38607 SUBJECT: EP241217a: Xinglong optical follow-up observations DATE: 24/12/18 07:04:57 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn
Junjie-Jin (NAOC), Yiming-Mao(NAOC), Zheng-Jie (NAOC), Haiyang-Mu(NAOC), Yinan-Zhu (NAOC), Qi-Zhao (NAOC), Feng-Xiao (NAOC), Zhou-Fan (NAOC), Hong-Wu (NAOC) report: We observed the field of the X-ray transient, EP 241217a by the Xinglong 0.8-m and 216 telescope located at Xinglong, Hebei, China. We obtained 6 x 600 s clear-band by 0.8-m telescop with a median time of 2024-12-17T10:12:27 , i.e., 5.5 hr after the EP trigger. We detected no optical object with the upper limit ～21 mag. Then we performed photometry on the Xinglong 2.16-m telescope located at Xinglong, Hebei, China, and obtained 6x600s clear-band frames with a median time of 2024-12-17T16:50:08 , i.e., 12 hr after the EP trigger. The optical object reported by Levan et al. (GCN #38587) is weakly detected in our image. We measure a preliminary magnitude of r = 21.4 +/- 0.14 mag (AB), calibrated against nearby stars from the Pan-STARRS catalog.
We summarize our observation results as follows:
Obs. No. | Time (UTC) | Exposure Time (s) | Filter | Apparent mag (AB) | Telescope Name
1 | 2024-12-17 10:12:27 | 6x600 s | Clear |> 21.0 | Xinglong 80-cm Telescope
2 | 2024-12-17 16:50:08 | 6x600 s | Clear | 21.4 +/- 0.14 | Xinglong 2.16-m Telescope
View this GCN Circular online at https://gcn.nasa.gov/circulars/38607. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...