We report the classification of one optical transient and the observations of two more, observed on 2023 October 24. Observations were performed on the Nordic Optical Telescope (NOT) at El Roque de Los Muchachos (Spain) using the ALFOSC instrument as part of the 2023 NOT observing school.
AT 2023vrq, shows a blue featureless conitnuum with a potential identification of a broad line at ~5050A. The ZTF light-curve shows that a rise of ~1.5 mags in ~3 days. The transient is 10 degress from the Galactic plane so we note the posibility of being a CV.
AT 2023vco is a ~ 1 week post-peak transient, noted as "Nuclear transient" from the Sherlock classification software (coincident with the host nucleus). The spectrum is blue and shows some potential broad features, one at ~ 7489A (but blended with the telluric) and one at ~ 6100A. No narrow host line can be identified.
Further observations of the above 2 transients are 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 | 2023vbx | 02:22:46.029 | +26:27:35.71 | SN IIn | 0.033 | SDSS J022245.94+262734.0 | Redshift derived from SNID (Blondin and Tonry 2007 2007ApJ...666.1024B) fit. The light-curve is rising. At the last ZTF g-band detection (m=18.4, MJD=60241.4), the above redshift would imply an absolute magnitude of M~ -17.4. | 02:22:46.032 | +26:27:35.58 | SN IIn | 0.033 | |
| TNS | 2023vco | 02:23:18.740 | -21:03:16.99 | Other | The light-curve is declining (~1 week post-peak). The last ZTF g-band detection is at m=18.9 (MJD=60242.4). | 02:23:18.740 | -21:03:16.99 | SLSN-I | 0.167 | |||
| TNS | 2023vrq | 20:24:09.598 | +16:21:24.07 | Other | The light-curve is rising. The last ZTF g-band detection is at m=18.5 (MJD=60242.1). | 20:24:09.575 | +16:21:24.14 |
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