DRAFT
2023-08-14 15:35:44
Type: Object/s-Discovery/Classification
Bibcode: 2023TNSAN.224....1G
GOTO-FAST spectroscopic classifications of optical transients
Authors: B. Godson, B. Warwick, D. O'Neill, J. Lyman, T. Killestein, M. Pursiainen, D. Coppejans, G. Ramsay, R. Kotak, K. Ackley, M. J. Dyer, K. Ulaczyk, F. Jiminez-Ibarra, A. Kumar, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. P. Breton, L. K. Nuttall, E. Pall'e, D. Pollacco on behalf of GOTO
Source Group: GOTO
Keywords: Transient, Supernova, Optical, Spectroscopy
Abstract:
This report includes classifications of 4 Type Ia SNe and two SNe of uncertain class. SN2023pgr exhibits a H-rich flash-ionised spectrum with Balmer lines and a blend of HeII, CIII and NIII emission lines at 4650Å at z=0.08. SN2023ozo is a H-poor SN that shows OII "w" absorption at around 4500Å, similar to what is seen in Type I SLSNe or some young core collapse SNe. Follow-up observations are encouraged.

GOTO Fast Analysis and Spectroscopy of Transients (GOTO-FAST) is an optical classification and follow-up survey to observe transients discovered by the Gravitational-Wave Optical Transient Explorer (GOTO) on La Palma, Spain. Operating with the Isaac Newton Telescope (INT), also on La Palma, GOTO-FAST is ideally situated to obtain spectroscopic classifications of GOTO transients immediately upon discovery.

GOTO-FAST reports the classifications of the following optical transients. The observations were obtained on the Isaac Newton Telescope (INT) between 2023 Aug 09 and Aug 13 using the IDS spectrograph with R150V grating (3950-7900 Å, R ~600). The transients were classified using SNID (Blondin & Tonry 2007).

Targets were supplied by the Gravitational-wave Optical Transient Observer GOTO (Steeghs et al. 2022), ATLAS survey (Smith et al. 2020), and the Zwicky Transient Facility (ZTF; Bellm et al. 2019) - data stream processed through the Lasair broker (Smith, Williams, Young et al. 2019) and by the ALeRCE broker (Forster et al. 2020)

The classified objects  are listed below in the Related Objects Table.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Source Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2023oxa [GOTO23wf] 13:41:48.700 +26:23:28.68 SN Ia 0.075 Matches to normal SNe Ia around a week post-peak. Redshift from putative host galaxy group. 13:41:48.700 +26:23:28.68 SN Ia 0.075
TNS 2023oza [GOTO23yj] 17:00:59.856 +22:40:10.23 SN Ia 0.06 Matches to normal SNe Ia around peak. Redshift from SNID. 17:00:59.853 +22:40:10.05 SN Ia 0.06
TNS 2023ozo [ATLAS23qqc] 16:19:05.043 -01:54:25.55 SN Young H-poor SN with w-shaped OII absorption. Good template matches to known SLSNe-I, but the redshift is uncertain. 16:19:05.040 -01:54:25.45 SN 0.055
TNS 2023pbe [ATLAS23qse] 21:50:39.982 +13:17:07.32 SN Ia 0.02016 We find good template matches with normal SNe Ia around peak. Redshift taken from the host galaxy. 21:50:39.980 +13:17:07.30 SN Ia 0.02016
TNS 2023pgr [GOTO23aan] 23:47:33.200 +16:58:16.41 SN 0.08 a H-rich flash-ionised spectrum with Balmer lines and a blend of HeII, CIII and NIII emission lines at 4650Å at z=0.08 23:47:33.204 +16:58:16.91 SN 0.08
TNS 2023oqt [ATLAS23qjn] 18:20:40.198 +59:38:47.05 SN Ia 0.087 We find good matches to normal SNe Ia around peak. Redshift obtained from template matching with SNID. 18:20:40.198 +59:38:47.05 SN Ia 0.087

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