TNS Classification Report No. 21742 [ 2025TNSCR3139....1C ]

Date Received (UTC): 2025-08-10 15:16:35
Sender: Ryan Chornock
Group: None

R. Chornock, E. Hammerstein (UC Berkeley), X. J. Hall (CMU), R. Stein (UMD), M. Nicholl (QUB), X. Guo (UC Berkeley), on behalf of the ZTF Collaboration report/s a classification of object: SN 2025sei

Type: SLSN-I
Redshift: 0.0949

Remarks: High luminosity and strong O II features between 3800 and 4600 Angs (rest frame).

The following Classification spectrum was provided:

Obsdate: 2025-08-02 04:53:46
Instrument: KAST
Telescope: 3m Lick Shane Reflector

Remarks: Vacuum wavelengths

Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2025sei