Models¶
Here is a list of the response specification for each data model.
Object Response¶
| Name | Type | Description |
|---|---|---|
| oid | string | ZTF Object identifier |
| ndethist | string | Number of spatially-coincident detections falling within 1.5 arcsec going back to beginning of survey; only detections that fell on the same field and readout-channel ID where the input candidate was observed are counted. All raw detections down to a photometric S/N of ~ 3 are included. |
| ncovhist | integer | Number of times input candidate position fell on any field and readout-channel going back to beginning of survey |
| mjdstarthist | number | Earliest Modified Julian date of epoch corresponding to ndethist [days] |
| mjdendhist | number | Latest Modified Julian date of epoch corresponding to ndethist [days] |
| corrected | boolean | Whether the corrected light curve was computed and can be used |
| stellar | boolean | Whether the object is a likely stellar-like source |
| ndet | integer | Total number of detections for the object |
| g_r_max | number | Difference between the minimum g and r band difference magnitudes ( min(g) - min(r) ) |
| g_r_max_corr | number | Difference between the minimum g and r band corrected magnitudes ( min(corrected(g)) - min(corrected(r)) ) |
| g_r_mean | number | Difference between the mean g and r band difference magnitudes ( mean(g) - mean(r) ) |
| g_r_mean_corr | number | Difference between the mean g and r band corrected magnitudes ( mean(corrected(g)) - mean(corrected(r)) ) |
| firstmjd | number | First detection’s modified julian date |
| lastmjd | number | Last detection’s modified julian date |
| deltajd | number | Difference between last and first detection date |
| meanra | number | Mean Right Ascension |
| meandec | number | Mean Declination |
| sigmara | number | Right Ascension standard deviation |
| sigmadec | number | Declination standard deviation |
| class | string | Highest probability class or according to specified classifier and ranking (Default classifier: lc_classifier, ranking: 1) |
| classifier | string | Classifier name. |
| probability | number | Highest probability or according to specified classifier and ranking (Default classifier: lc_classifier, ranking: 1) |
| step_id_corr | string | CorrectionStep pipeline version. |
Detection Response¶
| Name | Type | Description |
|---|---|---|
| mjd | number | Modified julian Date |
| candid | string | Alert unique identifier. |
| fid | integer | Filter ID (1=g; 2=r; 3=i) |
| pid | integer | Processing ID for image |
| diffmaglim | number | 5-sigma mag limit in difference image based on PSF-fit photometry [mag] |
| isdiffpos | number | 1: candidate is from positive (sci minus ref) subtraction; -1: didate is from negative (ref minus sci) subtraction |
| nid | integer | Night ID |
| ra | number | Right Ascension of candidate [deg] |
| dec | number | Declination of candidate [deg] |
| magpsf | number | Magnitude from PSF-fit photometry [mag] |
| sigmapsf | number | 1-sigma uncertainty in magap [mag] |
| magap | number | Aperture mag using 8 pixel diameter aperture [mag] |
| sigmagap | number | 1-sigma uncertainty in magap [mag] |
| distnr | number | Distance to nearest source in reference image PSF-catalog within 30 arcsec [pixels] |
| rb | number | RealBogus quality score; range is 0 to 1 where closer to 1 is more reliable |
| rbversion | string | Version of RealBogus model/classifier used to assign rb quality score |
| drb | number | RealBogus quality score from Deep-Learning-based classifier; range is 0 to 1 where closer to 1 is more reliable |
| drbversion | string | Version of Deep-Learning-based classifier model used to assign RealBogus (drb) quality score |
| magapbig | number | Aperture mag using 18 pixel diameter aperture [mag] |
| sigmagapbig | number | 1-sigma uncertainty in magapbig [mag] |
| rfid | number | Processing ID for reference image to facilitate archive retrieval |
| magpsf_corr | number | Corrected PSF magnitude |
| sigmapsf_corr | number | Error of the corrected PSF magnitude assuming no contribution from an extended component |
| sigmapsf_corr_ext | number | Error of the corrected PSF magnitude assuming a contribution from an extended component |
| corrected | boolean | Whether the corrected photometry was applied |
| dubious | boolean | Whether the corrected photometry should be flagged |
| parent_candid | number | Parent candid if alert coming from prv_detection (null if no parent) |
| has_stamp | boolean | Whether the detection has an associated image stamp triplet (when parent_candid = null) |
| step_id_corr | string | Correction step pipeline version |
Non-Detection Response¶
| Name | Type | Description |
|---|---|---|
| mjd | number | Observation Julian date at start of exposure [days] |
| fid | integer | Filter ID (1=g; 2=r; 3=i) |
| diffmaglim | number | 5-sigma mag limit in difference image based on PSF-fit photometry [mag] |
Probability Response¶
| Name | Type | Description |
|---|---|---|
| classifier_name | string | Classifier name |
| classifier_version | string | Classifier version |
| class_name | string | Class |
| probability | number | Probability |
| ranking | integer | Ranking within the classifier type |
Magstats Response¶
| Name | Type | Description |
|---|---|---|
| fid | integer | Filter ID (1=g; 2=r; 3=i) |
| stellar | boolean | Whether the object appears to be unresolved in the given band |
| corrected | boolean | Whether the corrected photometry should be used |
| ndet | integer | Number of detections in the given band |
| ndubious | integer | Number of dubious corrections |
| dmdt_first | number | Initial rise estimate, the maximum slope between the first detection and any previous non-detection |
| dm_first | number | The magnitude difference used to compute dmdt_first |
| sigmadm_first | number | The error of the magnitude difference used to compute dmdt_first |
| dt_first | number | The time difference used to compute dmdt_first |
| magmean | number | The mean magnitude for the given fid |
| magmedian | number | The median magnitude for the given fid |
| magmax | number | The max magnitude for the given fid |
| magmin | number | The min magnitude for the given fid |
| magsigma | number | Magnitude standard deviation for the given fid |
| maglast | number | The last magnitude for the given fid |
| magfirst | number | The first magnitude for the given fid |
| magmean_corr | number | The mean corrected magnitude for the given fid |
| magmedian_corr | number | The median corrected magnitude for the given fid |
| magmax_corr | number | The max corrected magnitude for the given fid |
| magmin_corr | number | The min corrected magnitude for the given fid |
| magsigma_corr | number | Corrected magnitude standard deviation for the given fid |
| maglast_corr | number | The last corrected magnitude for the given fid |
| magfirst_corr | number | The first corrected magnitude for the given fid |
| firstmjd | number | The time of the first detection in the given fid |
| lastmjd | number | The time of the last detection in the given fid |
| step_id_corr | string | Correction step pipeline version |
