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Table 4.
Selection of the SN IIn sample.
| Selection of SNe | Number of SNe |
|---|---|
| All SNe found and classified by PTF/iPTF 2009−2017 | 3018 |
| Spectroscopically classified SNe II | 692 |
| Spectroscopically classified SNe IIn | 111 |
| SNe IIn having upper limits less than 40 d before discovery | 55 |
| SNe IIn also having detections past 40 d after discovery | 42 |
Notes. The selection of SNe II(n) in each row is a subset of the SNe in the row above. The 692 “SNe II” include SNe IIP/L/b/n. The 40 d mentioned is in the observer’s frame. The 15 SLSNe II found by PTF/iPTF are not included in the SNe II row and below.
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