DRAFT
2024-02-13 13:05:26
Type: Object/s-Discovery/Classification
Bibcode: 2024TNSAN..48....1W
GOTO-FAST identification of a flash-ionised Type II supernova at 42 Mpc
Authors: B. Warwick, B.Godson, M. Pursiainen, M. Mitchell, M. J. Dyer, D. O'Neill, J. Lyman, A. Sahu, T. Killestein, A. Kumar, D. Coppejans, G. Ramsay, R. Kotak, B.Gompertz, K. Ackley, 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:
Here we report the classification of the nearby and young Type II SN 2024cld.

AT 2024cld was discovered and classified as part of the GOTO-FAST Astronote 2023-224 program. AT 2024cld was discovered by GOTO at 2024-02-13 05:28:41 at 17.96 mag, with a non-detection down to ~18.7 mag 23 hours previous (2024-02-12T06:25:26).
A spectroscopic observation with the INT/IDS instument began 28 minutes post-discovery by GOTO with R150V grating (3950-7900 Å, R ~600).

The spectrum shows a blue continuum with strong narrow Balmer emission lines, and a slightly broader complex around He II 4686A that is likely to include some contribution of NIII and CIII lines. Such features are characteristic of Flash-ionised features in young Type II SNe.

The narrow lines indicate a redshift of z~0.014, slightly larger than the coincident galaxy NGC 6004, which is at z=0.01277 and a TF-distance of 42Mpc.
 

Follow-up observations are planned over the coming nights.

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 2024cld [GOTO24ql] 15:50:21.608 +18:56:21.07 SN II 0.014 NGC 6004 0.01277 15:50:21.550 +18:56:20.22 SN II 0.014

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