AT2024cew was discovered by GOTO (Steeghs et al. 2022) as part of of targeted observations of GRB 240209A (Fermi GBM Team, GCN 35712). GOTO discovered AT2024cew at 2024-02-11 05:27:37.728 with L~19.65 (Belkin et al. 2024, GCN 35715). There is no evidence of this source in previous GOTO observations, ZTF observations provided by Lasair broker (Smith et al. 2019) or ATLAS forced photometry server (Shingles et al. 2021). The most recent non-detection was taken by ATLAS on 2024-02-01. This object was of interest due to the initial fading nature over three GOTO epochs and the location with respect to the Fermi GRB localisation region. A spectroscopic observation with the INT/IDS instrument with R150V grating (3950-7900 Å, R ~600) was performed on the night of 2024 Feb 13 as part of the GOTO-FAST program (AstroNote 2023-224).
The transient is consistent with a Type Ia SN at a redshift of z=0.15 as classified using SNID (Blondin & Tonry 2007). SNID shows additional matches to 91T-like SN, which is consistent with the high luminosity implied by the redshift.
| 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 | 2024cew [GOTO24pw] | 17:01:05.291 | +68:43:46.30 | SN Ia-pec | 0.15 | WISEA J170106.59+684348.0 | 0.16 | Redshift obtained from NED. SNID provides good matches to normal type Ia SNe and Ia-91T-like | 17:01:05.291 | +68:43:46.30 | SN Ia-pec | 0.15 |
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