DIA source

Measurements for sources detected in difference images.

Schema: DiaSource table

Access

The DIA source table is accessible via the TAP and Butler services.

Recommended access service: TAP

TAP

• Citation: NSF-DOE Vera C. Rubin Observatory (2025); Legacy Survey of Space and Time Data Preview 2: DiaSource searchable catalog <doi-tbd>

• Table name: DiaSource

• Columns: <tbd>

• Rows: <tbd>

Butler

• Citation: NSF-DOE Vera C. Rubin Observatory (2025); Legacy Survey of Space and Time Data Preview 2: source dataset type <doi-tbd>

• Dataset type: (‘dia_source’, {skymap, tract}, ArrowAstropy)

• Format: Parquet

• Number of Butler datasets: <tbd>

Description

A “DIA source” is a signal-to-noise ratio > 5 detection in a difference image.

The DIA source table contains measurements on a difference image at the coordinates of every source detected in that difference image. These measurements include PSF-fit and forced PSF fluxes, and aperture and trailed-source fluxes. Forced PSF fluxes on the corresponding visit (i.e., “direct” or “science”) image at the coordinates of the DIA source are also included.

Processing

The DIA source table is the result of Difference image analysis (DIA).

Tutorials

See the 200-level catalog Tutorials for a notebook on the DIA source table.