DRAFT
2025-02-10 14:15:38
Type: Object/s-Discovery/Classification
Bibcode: 2025TNSAN..53....1M
ePESSTO+ spectroscopic classification of optical transients
Authors: D. Magill (QUB), J. Gillanders (Oxford), C. Angus, M. Fulton (QUB), Sara Faris (Tel Aviv), Michel Dennefeld (IAP), Lluís Galbany (ICE, CSIC), 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), E. Zimmerman (Weizmann), J. Tonry, L. Denneau, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), S. J. Smartt (Oxford/QUB), A. Aamer, K. W. Smith, M. McCollum, T. Moore, J. Weston (QUB), L. Shingles (GSI/QUB), L. Rhodes (Oxford), J. Sommer (LMU/QUB), A. Rest (STScI), C. Stubbs (Harvard), X. Sheng(QUB), P. Ramsden (QUB/Birmingham)
Source Group: ePESSTO+
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 3 Type Ia's, 1 Type II and 1 Type IIb supernova. SN2025bco is an infant Type II, showing strong flash ionisation features. 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 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 2025 Feb 09, 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 Source Phase (days) Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025app [ATLAS25bfk] 04:02:17.686 +10:12:39.77 SN Ia 0.04 -3 to +3 days Redshift from template matching 04:02:17.714 +10:12:39.73 SN Ia 0.04
TNS 2025azf [GOTO25acr] 09:03:59.108 +00:44:25.34 SN Ia 0.053 WISEA J090358.97+004423.7 0.053063 -5 to -3 days Redshift from host galaxy redshift in NED 09:03:59.108 +00:44:25.34 SN Ia 0.053
TNS 2025bbx [ATLAS25bmy] 14:47:08.494 -39:30:33.65 SN Ia 0.067 WISEA J144707.97-393039.3 0.066593 -3 to +3 days Redshift from host galaxy redshift in NED 14:47:08.494 -39:30:33.65 SN Ia 0.067
TNS 2025bco [ATLAS25bnf] 13:15:43.304 -00:28:18.66 SN II 0.036 WISEA J131543.18-002818.0 0.03633 -7 to -5 days Redshift from host galaxy redshift in NED. Strong flash ionisation features consistent with a young core collapse SN 13:15:43.304 -00:28:18.66 SN II 0.036
TNS 2025bcn [ATLAS25bne] 13:59:21.062 -40:04:24.32 SN IIb 0.013 ESO 325- G 042 0.013226 -7 to -4 days Redshift from host galaxy redshift in NED 13:59:21.062 -40:04:24.32 SN IIb 0.013

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