DRAFT
2025-08-13 13:39:28
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN.256....1D
ePESSTO+ spectroscopic classification of optical transients
Authors: J. N. D. van Dalen (Radboud), D. B. Malesani (DAWN/NBI Radboud), G. Corcoran (UCD) , L. Cotter (UCD), A. Martin-Carrillo (UCD), G. Pignata (UTA), A. Aryan (NCU, Taiwan) , M. Dennefeld (IAP), J. Sollerman (Stockholm), S. Srivastav (Oxford), S. Smartt (Oxford), O. Yaron (Weizmann), A. Singh (Stockholm U.), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (QUB), T. Müller Bravo (Trinity), P. Pessi (Stockholm), D. Young (QUB), E. 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), K. W. Smith (Oxford/QUB), H. Stevance (Oxford), M. Fulton, M. McCollum, T. Moore, l, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard),K. C. Chambers, M. Huber, A. Schultz, T. de Boer, J. Bulger, J. Fairlamb, C.-C. Lin, T. Lowe, E. Magnier, P. Minguez, R. J. Wainscoat, H. Gao (IfA, Hawaii)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 2 Type Ia,1 SLSN, 1 Type IIn and one unknown transient.

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 Pan-STARRS Survey for Transients (Chambers et al. 2016 2016arXiv161205560C), 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 (Smith, Williams, Young et al. 2019 2019RNAAS...3...26S) 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 the 12th of August 2025, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B), GELATO (Harutyunyan et al. 2008 2008A&A...488..383H), Superfit (Howell et al. 2005 2005ApJ...634.1190H) and NGSF (Next Generation SuperFit; AstroNote 2022-191, Howell et al. 2005 2005ApJ...634.1190H).

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 2025sfo [ZTF25abcydiy] 21:20:17.548 -17:12:31.95 SLSN-I 0.22 21:20:17.548 -17:12:31.95 SLSN-I 0.22
TNS 2025sns [ZTF25abeuvaa] 21:51:37.871 -27:14:52.93 SN Ia 0.086 21:51:37.871 -27:14:52.93 SN Ia 0.091
TNS 2025tpu [ATLAS25jhf] 18:47:40.504 -63:09:39.50 SN IIn 0.015 18:47:40.504 -63:09:39.50 SN IIn 0.015
TNS 2025tpt [ATLAS25jgf] 21:16:16.200 -68:02:19.18 SN Ia 0.071 21:16:16.200 -68:02:19.18 SN Ia 0.071
TNS 2025pjf [ATLAS25gxn] 21:37:44.987 -18:11:11.26 0.054 WISEA J213744.97-181112.1 Unknown transient with redshift derived from the galaxy emission lines. 21:37:44.987 -18:11:11.26 0.054

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