DIA source#

Measurements for sources detected in difference images.

Schema: DiaSource table

Access#

The DIA source catalog 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 1: DiaSource searchable catalog DOI Logo https://doi.org/10.71929/rubin/2570317 [BibTeX]

  • Table name: DiaSource

  • Columns: 87

  • Rows: 3,086,404

Butler#

  • Citation: NSF-DOE Vera C. Rubin Observatory (2025); Legacy Survey of Space and Time Data Preview 1: source dataset type DOI Logo https://doi.org/10.71929/rubin/2570322 [BibTeX]

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

  • Format: Parquet

  • Number of Butler datasets: 1,786

DIA sources are sharded by tract, not visit in order to make them easier to join to their DIA object.

Description#

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

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

Tutorials#

See the 200-level notebook or 200-level portal tutorials demonstrating how to access the DIA source table.