DRAFT
2026-03-27 01:13:02
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN..87....1Z
Identification of the redshift of EP Transient EP260324a
Authors: Jiazheng Zhu (USTC), Ning Jiang (USTC), Linna Xu (USTC), Yibo Wang (USTC), Tinggui Wang (USTC), Mingxin Wu (USTC), Shifeng Huang (USTC).
Source Group: USTC-TDE

EP260324a was first reported by the EP team in an ATelon 2026 March 26 as an X-ray transient, exhibiting a gradual spectral softening during the first day. The FXT source, with a positional uncertainty radius of 10 arcsec, is located 2.4 arcsec from the galaxy SDSS J084412.34+820110.9 at R.A., Dec. = 131.05146, +82.01970 (J2000). It is therefore highly likely to be associated with the optical transient AT2026hir discovered in this galaxy on 2026 March 24. 

An optical spectrum was obtained with the Lijiang 2.4-m telescope on 2026 March 26. From the host galaxy absorption features, we measure a redshift of z = 0.087. The transient component appears very blue, although the observed spectrum is dominated by the host galaxy light.

At this redshift, the observed FXT flux corresponds to a 0.5–10 keV X-ray luminosity of 7.43 (-0.08/+0.08) × 10⁴⁴ erg s⁻¹.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026hir 08:44:12.377 +82:01:11.36 Other 0.087 08:44:12.377 +82:01:11.36 TDE 0.088

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