DRAFT
2026-05-27 03:40:38
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.154....1W
We report the rebrightening of the RNT AT2021aeuk detected by WFST.
Authors: Yibo Wang (USTC), Tinggui Wang (USTC), Ning Jiang (USTC), Shifeng Huang (USTC), Chengyi Wang (USTC), Mingxin Wu (USTC), Jiazheng Zhu (USTC), Jie Lin (USTC) on behalf of the WFST collaboration
Abstract:
We report the discovery of a new rebrightening event of the repeated nuclear transient AT2021aeuk in the WFST survey at MJD 61183.85.

AT2021aeuk was reported as a repeated nuclear transient (RNT) hosted by a narrow-line Seyfert 1 galaxy (Bao et al. 2024; Sun et al.2025). Two major flares were detected between 2018 and 2023, peaking at approximately MJD 58708 and 59995, respectively, along with a weak precursor prior to the first flare.
 

We recently detected a new rebrightening event of this target in the Wide Field Survey Telescope (WFST) survey on 61183.85, with u=19.13+/-0.03 and r=18.43+/-0.02. The rebrightening was further confirmed through cross-checking with ATLAS data. The newly detected flare, likely the third major flare, is still rising and has already surpassed the second flare in brightness. In addition, the time interval between the second and third flares is slightly shorter than that between the first and second flares. Therefore, AT2021aeuk joins the small sample of repeated nuclear transients with multiple flares. Multi-band follow-up observations have been triggered.

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 2021aeuk 16:12:59.842 +42:19:40.25 Other 16:12:59.842 +42:19:40.25

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