We report the discovery of a new optical transient (AT 2024dzc) discovered during GMOS imaging of NGC 1325 through the Young Supernova Experiment collaboration's Large and Long program (PI Jacobson-Galán) on 2024-03-06 22:15:29. The transient was confirmed after subtraction of a DECam/Legacy r-band image from the GMOS image. We estimate an r-band apparent magnitude of m_r = 22.7 mag, which translates to an absolute magnitude of M_r = -9.1 mag given a host galaxy distance of 23 Mpc and after correcting for MW extinction. We identify a progenitor counterpart in three epochs of archival HST imaging obtained on 1997-03-26 (F606W filter) and 2022-10-14 (F606W, F814W filters). Using the most recent HST images, we estimate progenitor apparent magnitudes of ~23.6 mag (F606W) and ~24.0 mag (F814W), suggesting that this transient is likely associated with variability of a massive star and/or some sort of outburst/eruption. We are grateful to the Gemini observers who carried out these observations. Spectroscopic follow-up is encouraged.
| 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 | 2024dzc | 03:24:21.750 | -21:33:33.16 | Other | 0.0053 | NGC 1325 | 0.0053 | 03:24:21.750 | -21:33:33.16 |
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