JWST Conventions

Naming Conventions

When produced through the ground processing, all association files are named according to the following scheme:

jwPPPPP-TNNNN_YYYYMMDDtHHMMSS_ATYPE_MMM_asn.json

where:

  • jw: All JWST-related products begin with jw
  • PPPPP: 5 digit proposal number
  • TNNNN: Canididate Identifier. Can be one of the following:
    • oNNN: Observation candidate specified by the letter o followed by a 3 digit number.
    • c1NNN: Association candidate, specified by the letter ‘c’, followed by a number starting at 1001.
    • a3NNN: Discovered whole program associations, specified by the letter ‘a’, followed by a number starting at 3001
    • rNNNN: Reserverd for future use. If you see this in practice, file an issue to have this document updated.
  • YYYYMMDDtHHMMSS: This is generically referred to as the version_id. DMS specifies this as a timestamp. Note: When used outside the workflow, this field is user-specifiable.
  • ATYPE: The type of association. See Association Types
  • MMM: A counter for each type of association created.

Association Types

Each association is intended to make a specific science product. The type of science product is indicated by the ATYPE field in the association file name (see asn-DMS-naming), and in the asn_type meta keyword of the association itself (see Association Meta Keywords).

The pipeline uses this type as the key to indicate which Level 2 or Level 3 pipeline module to use to process this association.

The current association types are:

  • image3: Intended for calwebb_image3 processing
  • spec3: Intended for calwebb_spec3 processing
  • wfs: Wave front sensing data, used by wfs_combine
  • ami3: Intended for calwebb_ami3 processing
  • coron3: Intended for calwebb_coron3 processing
  • tso3: Intended for calwebb_tso3 processing
  • image2: Intended for calwebb_image2 processing
  • spec2: Intended for calwebb_spec2 processing
  • nrslamp-spec2: Intended for calwebb_nrslamp_spec2 processing
  • tso-image2: Intended for calwebb_tso_image2 processing
  • tso-spec2: Intended for calwebb_tso_spec2 processing