DRAFT
2026-05-06 14:17:57
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.125....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: A. Sankar.K, A. Dutta, A. Aryan, Y.-H. Lee, M.-H. Lee, C.-H. Lai, T.-W. Chen (NCU), T. Kravtsov (UTU), C. Gutiérrez (ICE-CSIC), J. Khaulsay (Cardiff), C. Cárdenas (UA), A. Reguitti (INAF), J. Anderson (ESO), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (UTU), T. Müller Bravo (Trinity), P. J. Pessi (Warsaw), O. Yaron (Weizmann), D. R. Young (QUB), J. Sollerman (Stockholm), S. Faris (Tel Aviv University), E. A. Zimmerman (Weizmann), 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), 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), C. Stubbs (Harvard)
Source Group: ePESSTO+
Keywords: Astronomical Databases, Spectroscopy, Transient, Supernova, Optical
Abstract:
This report includes 1 Type IIn, 1 Type Ic-BL, 1 Type Ia and a 1 blue featureless SN.

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

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S), the Gravitational-wave Optical Transient Observer GOTO (see Dyer et al. 2020, SPIE, 11445 2020SPIE11445E..7GD) and BlackGEM (Groot et al, 2024, PASP, 136, 5003).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2026 May 5, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 16A resolution). Classifications were done using SNID-SAGE (Stoppa F., Smartt S.~J., 2026, arXiv, arXiv:2603.28741. doi:10.48550/arXiv.2603.28741) and DASH (Muthukrishna et al. 2019  2019ApJ...885...85M).

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 2026lkn [GOTO26edu] 12:49:29.088 -11:24:13.25 SN 0.047 ESO 386- G 008 GOTO Post peak Blue and featureless spectrum. Redshift from Hydrogen features. 12:49:29.093 -11:24:12.79 SN 0.047
TNS 2026jcw [BGEM J134822.89-311042.1] 13:48:22.893 -31:10:42.12 SN IIn 0.039 2MASX J13482285-3110337 0.039 BGEM Around peak Host redshift from NED. Similar redshift from SNID-SAGE 13:48:22.893 -31:10:42.12 SN IIn 0.039
TNS 2026lky [GOTO26edr] 12:45:09.332 -35:13:48.67 SN Ia 0.056 WISEA J124508.82-351336.9 0.053 GOTO Pre Peak Host redshift from NED. Phase from SNID-SAGE and ASTRODASH 12:45:09.372 -35:13:48.39 SN Ia 0.056
TNS 2026koi [ATLAS26etk] 17:21:51.566 +31:06:22.16 SN Ic-BL 0.09 ATLAS Post Peak Redshift from ASTRODASH 17:21:51.566 +31:06:22.16 SN Ic-BL 0.09

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