TITLE: GCN CIRCULAR NUMBER: 44782 SUBJECT: EP260530a: Xinglong optical spectroscopy of EP260530a / AT 2026nwl DATE: 26/06/03 03:03:14 GMT FROM: Xinglong Observatory at National Astronomical Observatories (NAOC), Chinese Academy of Sciences (CAS) <xinglong@nao.cas.cn> Xinglong optical observations Junjie-Jin (NAOC), Yiming-Mao (NAOC), Junjun-Jia (NAOC), Pengliang-Du (NAOC), Yu-Zhang (NAOC), Zhou-Fan (NAOC), Hong-Wu (NAOC) report: We obtained an optical spectrum of the Einstein Probe transient EP260530a (Wu et al., ATel #17824) using the Xinglong 2.16-m telescope. The observations targeted the optical counterpart candidate, AT 2026nwl, discovered by GOTO (TNS Astronomical Transient Report No. 306622). The observation was carried out on 2026 June 1 at 12:53:59 UT with BFOSC using the G4 grism and a 2.3-arcsec slit. The exposure time was 1800 s. The spectrum shows clear narrow emission lines from hydrogen and helium. View this GCN Circular online at https://gcn.nasa.gov/circulars/44782. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...