DRAFT
2025-05-03 16:05:30
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: B. Ayala (UNAB), C. Casanueva (PUC), R. Dastidar (UNAB), A. Gangopadhyay (SU,OKC) , Thallis de L. Pessi (ESO), S. Srivastav (Oxford), G. Pignata (UTA), P. Wiseman (Southampton), M. Pursiainen (Warwick), A. Horowicz (Weizmann), J. Anderson (ESO), T.-W. Chen (NCU), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), T. Müller Bravo (Trinity), P. Pessi (Stockholm), 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), 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: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 6 Type Ia's and 1 Type II SN. 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 (Smith, Williams, Young et al. 2019 2019RNAAS...3...26S) and by the ALeRCE broker (Forster et al. 2020 2021AJ....161..242F), and 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 2025 May 02, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B).

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 2025hsh [GOTO25bzh] 08:23:13.630 -77:51:10.06 SN II 0.02 ESO 018- G 007 0.018 Redshift and phase are from spectral matching with SNID. 08:23:13.630 -77:51:10.06 SN II 0.02
TNS 2025hyv [ATLAS25dzu] 09:09:17.173 -18:37:05.53 SN Ia 0.039 Redshift and phase are from spectral matching with SNID. 09:09:17.173 -18:37:05.53 SN Ia 0.039
TNS 2025hsv [ZTF25aaniiis] 08:27:27.150 -11:51:42.43 SN Ia 0.071 Redshift and phase are from spectral matching with SNID. 08:27:27.150 -11:51:42.43 SN Ia 0.071
TNS 2025iav [GOTO25cbn] 10:50:30.470 -28:53:17.22 SN Ia 0.061 WISEA J105030.27-285316.3 0.044 Best match from SNID yields a Type Ia at z=0.061. Host is a PUN. 10:50:30.470 -28:53:17.22 SN Ia 0.061
TNS 2025ift [ZTF25aantell] 09:40:30.373 -05:06:14.05 SN Ia 0.078 WISEA J094030.30-050608.8 0.078 The best matched from SNID is consistent with the host redshift. 09:40:30.373 -05:06:14.05 SN Ia 0.078
TNS 2025ilp [GOTO25cds] 10:59:19.998 +09:23:54.04 SN Ia 0.063 2MASX J10591993+0923563 0.063 Best match with Type Ia. Redshift match with SNID is consistent with the host galaxy redshift. 10:59:19.998 +09:23:54.04 SN Ia 0.063
TNS 2025ime [GOTO25cdx] 15:31:51.335 -01:11:12.20 SN Ia 0.037 WISEA J153150.41-011108.2 0.037 Best match is with a Type Ia at z=0.037 from SNID consistent with the host galaxy redshift. 15:31:51.335 -01:11:12.20 SN Ia 0.037

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