DIA forced source¶
Forced measurements in visit and difference images, at the coordinates of all DIA objects.
Schema: ForcedSourceOnDiaObject table
Access¶
The DIA forced 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: ForcedSourceOnDiaObject searchable catalog
https://doi.org/10.71929/rubin/2570321 [
BibTeX
]Table name:
ForcedSourceOnDiaObject
Columns: 28
Rows: 196,911,566
Butler¶
Citation: NSF-DOE Vera C. Rubin Observatory (2025); Legacy Survey of Space and Time Data Preview 1: dia_object_forced_source dataset type
https://doi.org/10.71929/rubin/2570320 [
BibTeX
]Dataset type: (‘dia_object_forced_source’, {skymap, tract, patch}, ArrowAstropy)
Format: Parquet
Number of Butler datasets: 597
Forced sources are sharded by patch
, not just tract
, because in regions with many epochs the size of a full tract
catalog becomes unwieldy.
Description¶
“Forced” photometry means a measurement made at a fixed coordinate in an image, regardless of whether an above-threshold region was detected there in that particular image.
The DIA forced source table contains forced PSF flux photometry on both the visit (i.e., “direct” or “science”) and difference images at the coordinates of every object in the DIA object table.
Processing¶
The DIA forced 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 forced source table.