Visit image (coming soon)#

Important

Prompt images are not yet available.

Individual processed and calibrated sky images.

Citation: <placeholder visit images DOI>

Access#

The visit images are not yet accessible.

Embargo: All promptly-processed visit images are subject to an 80-hour embargo period and will be released shortly after the embargo expires.

Butler#

  • Dataset type: (‘visit_image’, {band, instrument, day_obs, detector, physical_filter, visit}, ExposureF)

  • Format: FITS

SIA and TAP#

  • Schema: ObsCore table

  • IVOA calibration level: 2

  • Data Product Subtype: lsst.visit_image

Description#

Raw images from the camera undergo processing that includes instrument signature removal (ISR), image calibration (photometric and astrometric), and PSF estimation. The result is a fully calibrated visit image.

Each individual visit image contains data from one of the camera’s detectors.

Processing#

The creation of visit images is described in Single-frame processing.

Pixel data#

The visit 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 visit images retrieved from the Butler include information about the observation (e.g., pointing, weather), and the derived PSF, photometric calibration, and WCS.

Tutorials#

Coming soon.