Models

Here is a list of the response specification for each data model.

Object Response

Object Response Model
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

Detection Response Model
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