Table 1.
Our sample of 27 Type IIn SNe.
| IAU name | RA | Dec | z | Host galaxy | AV, MW | Surveys | tprec (days) |
|---|---|---|---|---|---|---|---|
| SN 1994ak | 09:14:01.47 | 40:06:21.5 | 0.0085 | NGC 2782 | 0.044 | – | – |
| SN 1999el | 20:37:17.72 | 66:06:11.5 | 0.0044 | NGC 6951 | 1.020 | – | – |
| SN 2002A | 07:22:36.14 | 71:35:41.5 | 0.0096 | UGC 3804 | 0.071 | – | – |
| SN 2002fj | 08:40:45.10 | –04:07:38.5 | 0.0147 | NGC 2642 | 0.060 | – | – |
| SN 2008fq | 20:25:06.20 | –24:48:28.0 | 0.0106 | NGC 6907/8 | 0.174 | CHASE | – |
| SN 2009au | 12:59:46.00 | –29:36:07.5 | 0.00944 | ESO 443-21 | 0.250 | CHASE | – |
| SN 2010jl | 09:42:53.33 | 09:29:41.8 | 0.0107 | UGC 5189A | 0.075 | PTF, CHASE | – |
| SN 2010jp | 06:16:30.63 | –21:24:36.3 | 0.0091 | NGC 2207 | 0.239 | CHASE | – |
| SN 2011A (1) | 13:01:01.19 | –14:31:34.8 | 0.00892 | NGC 4902 | 0.137 | CHASE | – |
| SN 2011fh | 12:56:14.01 | –29:29:54.0 | 0.00803 | NGC 4806 | 0.237 | CHASE | ≤ − 1235 to 0 |
| SN 2011js | 02:48:04.96 | –13:57:51.1 | 0.0139 | NGC 1103 | 0.065 | CHASE | – |
| PTF11qnf (2) | 05:44:54.14 | 69:09:06.9 | 0.01428 | UGC 3344 | 0.330 | PTF | – |
| SN 2013gc | 08:07:11.88 | –28:03:26.32 | 0.003406 | ESO 430-G20 | 1.252 | PTF, CHASE | −1263 to −230 |
| SN 2013ha | 06:15:49.85 | 66:50:19.4 | 0.0131 | LEDA 18729 | 0.295 | PTF | – |
| SN 2015bf | 23:24:49.03 | 15:16:52.0 | 0.01424 | NGC 7653 | 0.183 | – | – |
| SN 2015da | 13:52:24.11 | 39:41:28.6 | 0.00667 | NGC 5337 | 0.040 | PTF | – |
| ASASSN-15lf | 12:06:45.56 | 67:09:24.0 | 0.0083 | NGC 4108 | 0.049 | PTF | – |
| SN 2016aiy | 13:08:25.39 | –41:58:50.2 | 0.01 | ESO 323-G84 | 0.354 | DES | −1070 to −249 |
| SN 2016cvk | 22:19:49.39 | –40:40:03.2 | 0.0107 | ESO 344-G21 | 0.035 | CHASE, DES | −1117 to −319 |
| SN 2016ehw (3) | 08:36:37.50 | 73:35:04.8 | 0.012 | PGC 24209 | 0.054 | PTF | – |
| SN 2017gas | 20:17:11.35 | 58:12:09.0 | 0.01 | Anonymous | 1.066 | PTF, ZTF | – |
| SN 2018lkg (4) | 07:06:34.89 | 63:50:55.3 | 0.0107 | UGC 3660 | 0.131 | PTF, ZTF | – |
| SN 2019bxq | 16:57:58.58 | 78:36:13.5 | 0.014 | LEDA 84787 | 0.137 | PTF, ZTF | −3552 to −18 |
| SN 2019esa | 07:55:00.89 | –76:24:43.1 | 0.00589 | ESO 035-G18 | 0.497 | DES | – |
| SN 2019fmb | 12:26:43.68 | 56:04:32.8 | 0.016 | LEDA 40731 | 0.044 | ZTF | −136 to −19 |
| SN 2019njv | 20:19:57.2 | 15:22:38.7 | 0.01458 | Anonymous | 0.451 | ZTF | – |
| SN 2021foa(5) | 13:17:12.35 | –17:15:25.77 | 0.008386 | IC 863 | 0.223 | PTF, CHASE | −20 to −1 |
Notes. For each object, we report the IAU name, celestial coordinates, redshift, host galaxy, Galactic reddening (from Schlafly & Finkbeiner 2011), surveys from which we collected data and approximate time interval tprec before the explosion between the first and last observation of the precursors or activities. The redshifts are from the classification spectrum of each object. Objects for which we detected one or more eruptive episodes before the explosion are highlighted in bold.
SN Impostor according to de Jaeger et al. (2015).
Possibly an Impostor for Nyholm et al. (2017).
Classification as SN IIn from Pan et al. (2016), Tsvetkov et al. (2020).
Likely AGN activity or a Tidal Disruption Event, see Appendix A.
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