TNS Classification Report No. 16081 [ 2023TNSCR3050....1P ]

Date Received (UTC): 2023-11-22 19:34:01
Sender: Ismael Perez-Fournon
Group: SGLF

F. Poidevin, I. Pérez-Fournon (IAC & ULL), S. Geier (GRANTECAN & IAC), C. M. Gutiérrez (IAC & ULL), Z. Delgado-González (ULL), C. Jiménez Angel (IAC & ULL), R. Könyves-Tóth (Konkoly Observatory, Univ. of Szeged), R. Marques-Chaves (Univ. of Geneva), C. M. B. Omand (The Oskar Klein Centre), and R. Shirley (Univ. of Southampton) on behalf of the SGLF SLSN group report/s a classification of object: SN 2023vto

Type: SLSN-II
Redshift: 0.4846

Remarks: AT 2023vto (ZTF23abcvbqq) was selected for spectroscopic classification with GTC OSIRIS+ as a SLSN candidate from the slowly evolving ZTF light curve, the ALeRCE light curve classification and the faint likely host galaxy. The redshift of z = 0.4846 was determined from Mg II absorption in the reported GTC OSIRIS+ R2000B spectrum. Another OSIRIS+ spectrum using the R2500R VPH grism shows absorption lines from the host galaxy and faint Hbeta emission at a redshift consistent with the Mg II one. Therefore, we classify this transient as a type II SLSN.

The following Classification spectrum was provided:

Obsdate: 2023-11-21 22:30:53
Instrument: OSIRIS
Telescope: Gran Telescopio Canarias

Remarks: GTC OSIRIS+ R2000B.

Details of the object and its spectra can be viewed here: https://www.wis-tns.org/object/2023vto