GCN 44782: EP260530a: Xinglong optical spectroscopy of EP260530a / AT 2026nwl

2026-06-03T03:03:14.423Z | rev 0 | event: EP260530a

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.