On UT 2023 November 20 the Northern Extended Millimeter Array (NOEMA) observed the position of AT2023vth, a luminous fast blue optical transient at z=0.0747 (AstroNote #2023-114, AstroNote #2023-305). The image RMS in the upper side band (100 GHz) was 56 uJy.
A point source was detected at the position of AT2023vth with a flux density of 350 uJy, corresponding to a luminosity of 5E28 erg/s/Hz at 39 days post-discovery. This is 2.4x brighter than the flux density at 10 GHz (AstroNote #2023-317) and an order of magnitude less luminous than the LFBOTs AT2020xnd and AT2022tsd at a similar frequency and epoch (Ho et al. 2022, ApJ, 932, 116; Ho et al. 2023, arXiv:2311.10195).
Further observations are planned. We thank the NOEMA staff for rapidly scheduling and executing these observations.
| 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 | 2023vth | 17:56:34.401 | +08:02:37.32 | FBOT | 0.0747 | 17:56:34.401 | +08:02:37.32 | FBOT | 0.0747 | |||
| TNS | 2020xnd | 22:20:02.030 | -02:50:25.30 | 22:20:02.030 | -02:50:25.30 | |||||||
| TNS | 2022tsd | 03:20:10.863 | +08:44:55.63 | 03:20:10.863 | +08:44:55.63 |
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