Template coadd (coming soon)#

Important

Prompt images are not yet available.

The combination of processed images with the best seeing, for a patch of sky and for each of the six LSST filters, used as a template for difference imaging.

Citation: <placeholder template images DOI>

Access#

The template coadd images are not yet accessible.

Butler#

  • Dataset type: (‘template_coadd’, {band, skymap, tract, patch}, ExposureF)

  • Format: FITS

SIA and TAP#

  • Schema: ObsCore table

  • IVOA Calibration Level: 3

  • Data Product Subtype: lsst.template_coadd

Description#

The criteria for selecting input images is the third (33%) of images with the best image quality (best seeing). A mean stacking algorithm, weighted by inverse variance, combines selected exposures.

Each individual template coadd image covers a single patch of the sky: a quadrilateral sub-region of the overall skymap that covers approximately 79 square arcminutes. Patches slightly overlap at their edges. Template coadd images are for a single filter.

Processing#

The creation of template coadd images is described in Template generation.

Pixel data#

The template coadd images have three planes of pixel data.

  • Image: sky pixel data in flux units of nJy.

  • Variance: uncertainty (noise) in the flux in units of nJy^2.

  • Mask: an integer bitmask of representative flag values.

Metadata#

The metadata for template coadd images retrieved from the Butler include a list of the input visit images, and the derived PSF, photometric calibration, and WCS.

Tutorials#

Coming soon.