The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of AT2021afpo, AT2021agbf, AT2021agco.
The observation was obtained with the Asiago 1.82m Copernico Telescope (+ AFOSC; range 340-820 nm; resolution 1.4 nm).
AT2021afpo (ASASSN-21vf) is a Seyfert 1.5 galaxy at z=0. 2129 as measured by the low ionization line [O II] 372.7 nm. The high ionization lines of [O III] 496.0, 500.8 nm are shifted with respect to the galaxy rest frame by around 70 km/s.
AT2021agbf (ATLAS21bnbc) is a Type Ia SN few days before maximum. The redshift z~0.026 is derived from SNID/GELATO SN template fitting.
The low S/N spectrum of AT2021agco in UGC3855 (at z=0.010564 by Theureau et al. 1998 A&AS via NED) is consistent with an early Type II SN.
The classification was performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools.
| 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 | 2021afpo [ASASSN-21vf] | 01:00:48.612 | +13:06:39.96 | AGN | 0.2129 | WISEA J010048.49+130638.9 | 01:00:48.612 | +13:06:39.96 | AGN | 0.2129 | ||
| TNS | 2021agbf [ATLAS21bnbc] | 04:45:50.526 | +61:59:33.82 | SN Ia | 0.026 | 04:45:50.520 | +61:59:33.79 | SN Ia | 0.026 | |||
| TNS | 2021agco [PSP21al] | 07:28:10.500 | +58:30:12.80 | SN II | 0.010564 | UGC3855 | 0.010401 | 07:28:10.557 | +58:30:12.37 | SN II | 0.010564 |
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