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 |