DRAFT
2026-06-05 14:30:25
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: C.G. Touchard-Paxton (Trinity), M. Ghendrih (Lancaster), E. Charleton, C. Dashwood-Brown, N. Shiamtanis , P. Wiseman, P. Clark, M. Quilt,(Southampton), Claudia Gutiérrez (IEEC), Shubham Srivastav (QUB), Michel Dennefel (IAP Paris),J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Warsaw), O. Yaron (Weizmann), D. Young (QUB)
Source Group: ePESSTO+
Keywords: Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes a classification of 1 Type IIb supernova.

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

The target was supplied by the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 June 4, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID-SAGE (Stoppa F., Smartt S.~J., 2026, arXiv, arXiv:2603.28741. doi:10.48550/arXiv.2603.28741).

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 2026nmw [GOTO26fdl] 12:46:43.531 -40:01:30.26 SN IIb 0.015 GOTO Pre-peak Redshift from host galaxy lines. Phase from SNID-SAGE and ATLAS light curve. 12:46:43.531 -40:01:30.26 SN IIb 0.015

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