DRAFT
2026-05-05 16:32:59
Type: Object/s-Discovery/Classification
Bibcode: 2026TNSAN.123....1K
ePESSTO+ spectroscopic classification of optical transients
Authors: T. Kravtsov (UTU), C. Gutiérrez (ICE-CSIC), A. Reguitti (INAF), C. Cárdenas (UA), J. Khaulsay (Cardiff), A. Aryan,  A. Dutta, A. Sankar.K, Y.-H. Lee, Y.-H. Chen, Y.-Z. Hong (NCU), J. Anderson (ESO), T.-W. Chen (NCU), 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. 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 classifications of 15 Type Ia's, 1 Type IIb, 1 Type Ic, 2 Type II and 1 SLSN. We encourage followup observations.

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 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 May 4, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution) and Grism 11 (3380-7520A, 16A resolution). Classifications were done using GELATO (Harutyunyan et al. 2008 2008A&A...488..383H),  NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H), 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 2026kiw [ATLAS26epu] 23:17:20.313 -17:20:21.31 SN Ia 0.042 WISEA J231721.09-172022.9 Post-peak Spectroscopic redshift from NED. 23:17:20.313 -17:20:21.31 SN Ia 0.042
TNS 2026kuh [GOTO26dyx] 08:55:17.289 -14:31:27.39 SN Ia 0.05 WISEA J085517.53-143132.0 Pre-peak Redshift from ASTRODASH and SNID-SAGE. 08:55:17.289 -14:31:27.39 SN Ia 0.05
TNS 2026law [GOTO26ecb] 10:12:15.454 +09:16:57.07 SLSN-I 0.1 WISEA J101215.74+091655.6 Pre-peak Redshift from SNID-SAGE. Spectroscopic redshift (0.6, not reliable) from DESI-DR1. 10:12:15.454 +09:16:57.07 SLSN-I 0.1
TNS 2026lel [ZTF26aaulhso] 10:00:52.922 +09:08:18.44 SN Ia 0.058 WISEA J100053.01+090821.3 Pre-peak Spectroscopic redshift from DESI-DR1. 10:00:52.913 +09:08:18.26 SN Ia 0.058
TNS 2026lfm [ATLAS26fbo] 09:25:34.578 -13:57:00.52 SN Ic 0.037 WISEA J092534.60-135651.8 Around-peak Spectroscopic redshift from NED. 09:25:34.567 -13:57:00.15 SN Ic 0.037
TNS 2026kzy [GOTO26eca] 09:53:19.494 +07:58:19.43 SN Ia 0.063 WISEA J095319.33+075818.6 Pre-peak Spectroscopic redshift from NED. 09:53:19.494 +07:58:19.43 SN Ia 0.063
TNS 2026koe [ATLAS26etg] 10:05:25.723 -27:37:54.17 SN Ia 0.051 WISEA J100525.64-273752.4 Post-peak Spectroscopic redshift from NED. 10:05:25.723 -27:37:54.17 SN Ia 0.051
TNS 2026lec [ATLAS26ezs] 22:39:55.140 -22:09:39.46 SN IIb 0.04 WISEA J223955.19-220937.9 Post-peak Redshift and Phase from SNID-SAGE. 22:39:55.140 -22:09:39.46 SN IIb 0.04
TNS 2026kjm [ZTF26aatktdb] 12:24:35.399 +07:43:41.01 SN Ia 0.07 WISEA J122435.44+074339.8 Post-peak Redshift from SNID-SAGE. 12:24:35.389 +07:43:40.92 SN Ia 0.073
TNS 2026lba [ZTF19aaloljd] 12:45:10.715 +03:49:29.57 SN Ia 0.077 WISEA J124510.69+034930.3 Around-peak Spectroscopic redshift from NED. 12:45:10.715 +03:49:29.57 SN Ia 0.078
TNS 2026kyf [ATLAS26exj] 17:52:02.511 -65:17:07.50 SN Ia 0.07 GALEXASC J175202.25-651702.4 Post-peak Redshift and phase from NGSF. 17:52:02.511 -65:17:07.50 SN Ia 0.07
TNS 2026lav [GOTO26eci] 16:24:24.258 +20:31:49.17 SN Ia 0.04 SDSS J162424.24+203149.1 Pre-peak Redshift and phase from NGSF. 16:24:24.258 +20:31:49.17 SN Ia 0.04
TNS 2026kfd [ATLAS26eob] 18:52:58.177 -81:39:18.50 SN Ia 0.056 AM 1842-814 NED01 Post-peak Spectroscopic redshift from NED. Phase from NGSF. 18:52:58.177 -81:39:18.50 SN Ia 0.056
TNS 2026kui [GOTO26dyz] 20:42:38.124 -35:04:28.71 SN II 0.09 WISEA J204238.12-350428.4 Around peak Redshift from H-features. 20:42:38.124 -35:04:28.71 SN II 0.09
TNS 2026ldw [ATLAS26ezl] 21:13:03.790 -58:43:09.95 SN Ia 0.05 WISEA J211303.76-584310.2 Post-peak Redshift and phase from NGSF. 21:13:03.790 -58:43:09.95 SN Ia 0.05
TNS 2026kye [ATLAS26exi] 20:49:58.759 -19:37:56.35 SN II 0.038 WISEA J204959.12-193755.0 Post-peak Spectroscopic redshift from NED. Phase from NGSF. 20:49:58.771 -19:37:56.72 SN II 0.038
TNS 2026kiz [ATLAS26epx] 21:48:48.822 -31:12:15.43 SN Ia 0.09 Post-peak Redshift and phase from NGSF. 21:48:48.822 -31:12:15.43 SN Ia 0.09
TNS 2026kir [ATLAS26epp] 22:06:01.883 -23:31:11.10 SN Ia 0.054 WISEA J220602.40-233109.2 Post-peak Spectroscopic redshift from NED. Phase from NGSF. 22:06:01.883 -23:31:11.10 SN Ia 0.054
TNS 2026kyg [ATLAS26exk] 22:26:40.815 -49:10:16.82 SN Ia 0.06 WISEA J220602.40-233109.2 Post-peak Redshift and phase from NGSF. 22:26:40.815 -49:10:16.82 SN Ia 0.06
TNS 2026ljl [ATLAS26fda] 22:27:22.588 -19:36:17.23 SN Ia 0.04 WISEA J222722.44-193626.5 Pre-peak Redshift and phase from NGSF. 22:27:22.588 -19:36:17.23 SN Ia 0.04

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