Archive User Support

MAST staff members assist science users of JWST data (and data from other hosted missions) with searches, notifications, the use of visualization tools, and standard or scripted data access and retrievals. Archive Contact Scientists will in addition assist JWST Observer teams and Archive Researchers with the preparation of high level science data products to be hosted at MAST.

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User support for MAST

MAST archive staff members assist the general science community with searches for data, visualization with Portal components, data retrievals, and also assist Principal Investigators with establishing authorization for their team members to access to their proprietary data. Archive science staff assist JWST PI and Archival Research teams in preparing High-Level Science Products (HLSPs) that will be hosted by MAST.

High level science products

HLSPs are required deliverables of funded JWST Archival Research programs, but are encouraged from any science team that uses JWST data as a part of their research. These data products should provide substantial science value to the general astronomical community, and have broader appeal beyond the original scope of the science goals for a particular program, or should provide technical insight into the preparation or execution of future science or calibration programs.

HLSPs are those derived at least in part from JWST (or other hosted mission) data holdings. These products generally include measurements of astrophysical target attributes, including:

  • locations
  • brightnesses
  • shapes
  • timeseries
  • spectral feature or light-curve characterizations

or other scientific attributes; or are:

  • stacks,
  • mosaics,
  • or other combinations

of images or spectra that are not produced by the standard processing pipelines. HLSPs for JWST may be be composed or derived in part from non-JWST data, including ground-based data, provided that they are critical to the goals of the primary JWST program.

Requirements for HLSP contributions

In order to enable meaningful searches on contributed datasets, and to provide a consistent and comprehensive set of metadata to users, there are a variety of requirements and recommendations for contributed datasets, in the following categories:

  • Acceptable data formats and data organization
  • Metadata content
  • File nomenclature
  • Data provenance

See the specific guidelines for contributing HLSPs to MAST for details.


MAST users who need assistance with archived data, or with the use of any of the related tools, should contact the Archive HelpDesk at


MAST Guidelines for HLSP Contributions

MAST YouTube videos of the Data Discovery Portal



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