DRAFT
2026-06-12 15:11:57
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.193....1C
ePESSTO+ spectroscopic classification of optical transients
Authors: E. Charleton (Southampton), M. Ghendrih (Lancaster), C.G. Touchard-Paxton (Trinity), P. Wiseman, N. Shiamtanis, P. Clark (Southampton), A. Aryan (NCU), F. Onori (INAF), S. Faris (Tel Aviv), J. Sollerman (Stockholm), M. Nicholl (QUB), 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), J. Tonry, L. Denneau, H. Weiland, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt, K. W. Smith (Oxford/QUB), S. Srivastav, H. Stevance (Oxford), D. R. Young, M. Fulton, M. McCollum, T. Moore, M. Nicholl, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes classifications of 3 Type Ia's, 1 Type Ib, I Type Ic-BL, and two unclassified objects showing a blue continuum, one of which is consistent with the nucleus of its host.

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

Targets tje ATLAS survey (Smith et al. 2020 2020PASP..132h5002S), the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the Lasair broker (Williams et al. 2024 2024RASTI...3..362W) and by the ALeRCE broker (Forster et al. 2020 2021AJ....161..242F), and 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 1, using EFOSC2 with Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3345-7470, 14A 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 Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2026odz [ZTF26aazngze] 12:42:23.918 -13:22:38.30 SN Ia 0.07 Redshift and phase from SNID-SAGE. 12:42:23.918 -13:22:38.30 SN Ia 0.07
TNS 2026ooa [ATLAS26gyi] 15:22:38.638 -33:44:44.73 Other Spectrum shows a blue continuum. 15:22:38.638 -33:44:44.73
TNS 2026okz [ATLAS26gvc] 20:36:18.542 -51:37:26.56 SN Ia-91T-like 0.05 Redshift measured from host line in the transient spectrum. Phase from SNID-SAGE. 20:36:18.542 -51:37:26.56 SN Ia-91T-like 0.05
TNS 2026olp [ATLAS26gwl] 22:35:38.444 -55:59:06.00 SN Ia-91T-like 0.05 Redshift and phase from SNID-SAGE. 22:35:38.444 -55:59:06.00 SN Ia-91T-like 0.05
TNS 2026mzm [ATLAS26fyd] 23:53:24.065 -27:21:06.23 Other 0.19 Redshift from narrow line in spectrum. Classification uncertain, between a Type IIn and a nuclear transient. Spectrum presents with an overall blue continuum. 23:53:24.065 -27:21:06.23 0.19
TNS 2026olw [ATLAS26gwt] 22:49:46.803 -26:24:12.60 SN Ib 0.028 Redshift measured from host line in the transient spectrum. Phase from SNID-SAGE. 22:49:46.803 -26:24:12.60 SN Ib 0.028
TNS 2026oot [GOTO26flr] 01:52:39.675 -17:12:01.29 SN Ic-BL 0.09 Redshift and phase from SNID-SAGE. 01:52:39.675 -17:12:01.29 SN Ic-BL 0.09

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