Table 2.
Pre-ZTF transients with a sibling transient detected in ZTF in single exposures.
| Pre-ZTF transient | ZTF transient | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Name | Type | MJD | Redshift | ZTF name | IAU name | Type | MJD | Peak mag | Sep (″) |
| AT 2017gcd | ? (*) | 57968 | 0.028593 | ZTF19acdgwhq | SN 2019aavr | Ia-norm | 58763 | −18.8 | 1.02 |
| AT 2017keg | ? (*) | 58068 | 0.05 | ZTF19acihgng | SN 2019tka | Ia-norm | 58781 | −19.1 (g) | 1.69 |
| SN 2013ld | ? (*) | 56522 | 0.02741 | ZTF18abavruc | SN 2021rgw | Ia | 59393 | −18.9 (g) | 0.57 |
| ASASSN-14ba | Ia pec/91T | 56796 | 0.032668 | ZTF22aaawghw | AT 2022csd | II | 59629 | −16.8 | 1.29 |
| SN 2017acp | II | 57785 | 0.0215 | ZTF19aavqics | SN 2019gxo | II | 58633 | −18.1 | 3.15 |
| SN 2014gz | II | 56678 | 0.02558 | ZTF21abcpbqd | SN 2021nof | II | 59362 | −17.2 (i) | 0.30 |
| SN 2009hz | II | 55046 | 0.0253 | ZTF18acotwcs | AT 2018iml | CV? (**) | 58439 | – | 0.33 |
| iPTF15wk | Ia | 57097 | 0.23 | ZTF21aaeebxm | – | ? | 59226 | −20.0 (g) | 0.31 |
| SN 2016bsc | Ia | 57500 | 0.05 | ZTF23aaeljse | (SN 2016bsc) | ? | 60043 | −17.9 | 1.61 |
| SNF20080522-001 | Ia | 54608 | 0.04872 | ZTF22aalbuig | AT 2022kuh | ? | 59724 | −17.3 | 1.64 |
| PS15ctg | Ia | 57328 | 0.078 | ZTF22abamjrf | AT 2022rol | ? | 59806 | −18.7 | 1.03 |
| iPTF15eot | II | 57357 | 0.039 | ZTF19aakvysq | AT 2019bll | ? | 58541 | −17.5 | 2.19 |
Notes. The first four columns give the name, type, discovery mjd, and redshift of the pre-ZTF transient, and the next five columns give the same information about its ZTF sibling when available. The second to last column gives an estimate of the peak r-band (unless specified otherwise) absolute magnitude of the ZTF transient assuming the pre-ZTF transient redshift, except for AT 2018iml as this is likely a foreground CV. The last column gives the separation between the siblings. A ? type means the transient was never spectroscopically classified. IAU names in parentheses are ZTF transients wrongly associated with a pre-ZTF transient.
Classified ZTF SNe that were wrongfully associated with the pre-ZTF name resulting in a misclassification. The pre-ZTF transient itself was never actually classified in the cases of AT 2017keg and SN 2013ld. The case of AT 2017gcd / SN 2019aavr has been fixed on TNS.
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