Table information for 'ztf.non_detection'

General

Table Description:

Upper limit measurements at object positions where no source was detected in ZTF images. Useful for constraining rise times and pre-discovery activity of transients.

This table is available for ADQL queries and through the TAP endpoint.

Resource Description:

Legacy ZTF astronomical catalog containing objects, detections, photometric measurements, classifications, and cross-matches from the Zwicky Transient Facility (ZTF) survey, as processed by the ALeRCE broker pipeline.

For a list of all services and tables belonging to this table's resource, see Information on resource 'ALeRCE ZTF Legacy Catalog'

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:ztf_non_detectio,
  year=2026,
  title={{ZTF} Non-Detections (Upper Limits)},
  author={{ALeRCE} Team},
  url={http://tap.alerce.online/tableinfo/ztf.non_detection},
  howpublished={{VO} resource provided by the {ALeRCE} {TAP} service}
}

Columns

Sorted alphabetically. [Sort by DB column index]

NameTable Head DescriptionUnitUCD
diffmaglim Diffmaglim 5-sigma limiting magnitude in difference image mag phot.mag;stat.max
fid Fid Filter identifier (1=g, 2=r, 3=i) N/A meta.id;instr.filter
mjd Mjd Modified Julian Date of the non-detection d time.epoch
oid Oid Object identifier N/A meta.id;src

Columns that are parts of indices are marked like this.

VOResource

VO nerds may sometimes need VOResource XML for this table.