Table 2
List of features used by SNGuess.
| Name | Type | Description | Source |
|---|---|---|---|
| tPredetect | Time | Time between final good upper limit and first detection | Photometric |
| tLC | Time | Duration (time between first and most recent detection) | Photometric |
| ndet | Int | Number of significant detections | Photometric |
| peaked | Bool | Is the lc estimated to be declining? | Photometric |
| pure | Bool | No significant nondetections after first detection | Photometric |
| rising | Bool | Max brightness close to the most recent detection | Photometric |
| norise | Bool | No (significant) detected rise | Photometric |
| hasgaps | Bool | The light curve has a gap between detections of at least 30 days | Photometric |
| mPeak | Mag | Magnitude at peak light (any band). Only calculated if peaked==True | Photometric |
| mDet | Mag | Magnitude at first detection (any band) | Photometric |
| mLast | Mag | Magnitude of the current (i.e. latest) detection (any band) | Photometric |
| cPeak | g−r | Color at peak (if peaked and with g and r) | Photometric |
| cDet | g−r | Color at detection (if with g + r) | Photometric |
| cLast | g−r | Color at last detection (if with g + r) | Photometric |
| slopeRise g, r | Mag/time | g or r mag slope between detection and peak (none if norise) | Photometric |
| slopeDecline g, r | Mag/time | g/r magnitude slope between peak and last detection (none unless peaked) | Photometric |
| rb (med) | Float | Median Real Bogus (all detections) | Photometric |
| drb (med) | Float | Median deep Real Bogus (if available, all detections) | Photometric |
| distnr | Pixel | Distance to nearest astronomical source in reference image | Metadata |
| magnr | Mag | Magnitude of nearest astronomical source in reference image | Metadata |
| classtar | Float | Star/Galaxy classification score from SExtractor | Metadata |
| sgscore1 | Float | Star/Galaxy score of closest astronomical source from PS1 catalog | Metadata |
| distpsnr1 | Arcsec | Distance to closest astronomical source from PS1 catalog | Metadata |
| sgscore2 | Float | Star/Galaxy score of next to closest astronomical source from PS1 catalog | Metadata |
| distpsnr2 | Arcsec | Distance to next to closest astronomical source from PS1 catalog | Metadata |
| neargaia | Arcsec | Distance to closest astronomical source from Gaia DR1 | Metadata |
| maggaia | Mag | Gaia (g-band) magnitude of closest astronomical source from Gaia DR1 catalog | Metadata |
Notes. The features are separated into photometric (created based on the transient light curve provided in the alert) and metadata (created based on the properties contained in the ZTF alerts of nearby detections in the references and in astronomical catalogues). While most of the features are self-explanatory, their explicit definitions can be found in Appendix C.
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