Table information for 'alerce_tap.ztf_non_detection'

General

Table Description:

ZTF non-detection upper limits providing 5-sigma magnitude limits from difference images when an object was not detected, useful for constraining object brightness and variability.

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

Resource Description:

Multi-survey astronomical object catalog containing astrometric and statistical information from multiple surveys. This table provides aggregated properties for astronomical objects including position, detection statistics, and temporal coverage.

For a list of all services and tables belonging to this table's resource, see Information on resource 'ALeRCE Multi-Survey Object Catalog'

Citing this table

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

@MISC{vo:alerce_tap_ztf_n,
  year=2026,
  title={{ZTF} Non-Detections},
  author={{ALeRCE} Team},
  url={http://tap.alerce.online/tableinfo/alerce_tap.ztf_non_detection},
  howpublished={{VO} resource provided by the {ALeRCE} {TAP} service}
}

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
oid Oid Unique identifier for this object N/A meta.id;src
sid Sid Survey identifier N/A meta.id
band Band Filter ID: 1=g, 2=r, 3=i N/A instr.bandpass
mjd Mjd Observation Modified Julian Date at start of exposure when non-detection occurred d time.epoch
diffmaglim Diffmaglim 5-sigma magnitude limit in difference image based on PSF-fit photometry, providing upper limit for object brightness mag phot.mag;stat.min
created_date Created_date Date record was created N/A time.creation

Columns that are parts of indices are marked like this.

VOResource

VO nerds may sometimes need VOResource XML for this table.