DRAFT
2025-07-15 14:29:18
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.214....1S
ePESSTO+ spectroscopic classification of optical transients
Authors: J. Sánchez-Sierras, J. Quirola-Vásquez (Radboud), T. Müller Bravo, K. Maguire (Trinity), D. O'Neill (Warwick), L. Galbany (ICE Barcelona), J. Sollerman (Stockholm), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), P. Pessi (Stockholm), O. Yaron (Weizmann), D. Young (QUB)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classification of one Type Ia 91T-like supernova.

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classification:

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2025 July 14, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B), using its Python implementation (https://github.com/FiorenSt/SNID-SAGE).

The classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025qtv [ATLAS25hfv] 13:52:16.482 +22:31:28.16 SN Ia-91T-like 0.028 IC 949 0.027807 Several SNID template matches with SNIa 91T- like aroud a week before peak. Redshifts of the templates consistent with that from the host galaxy. Light curve still rising with ATLAS o ~ -18.3 mag. 13:52:16.518 +22:31:28.30 SN Ia-91T-like 0.028
TNS 2025qsn [GOTO25esf] 16:00:38.325 +14:21:22.43 NA/Unknown Blue continuum. Fast rising transient on a very faint host. The object might be close to peak brightness. 16:00:38.334 +14:21:22.61 SN II 0.032

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