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
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
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.