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FITS Header Keywords for ground test data

This document outlines the strategies for enhancing the FITS header keywords to ensure uniformity and manageability of the extensive ground test data for the James Webb Space Telescope (JWST). The primary motivations include making data available for future calibration analysis, developing a standardized approach across instruments, and incorporating essential engineering data. By utilizing the FITSWriter software, we aim to extract relevant telemetry information systematically. The extended set of keywords will facilitate clear identification and description of data, thereby improving collaboration and data usability within the scientific community.

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FITS Header Keywords for ground test data

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  1. FITS Header Keywordsfor ground test data Rosa Diaz & Rusty Whitman Rosa Diaz & Rusty Whitman

  2. Motivation • Make the data readily available for future calibration analysis, … • Make manageable the large volume of data • Uniformity across instruments • How we can accomplish this? • All the information relevant to the data comes with the data • The databases have all the information that describes the data Rosa Diaz & Rusty Whitman

  3. FITSWriter software v2.2 (Release 3.0 has been delivered to IGSS) extracts information from the engineering telemetry to populate header keywords. • Primary header keywords subdivided in 4 categories • Standard FITS Header Keywords • JWST Mission Keywords • Observation Description • SCA Configuration Information • Readout Mode • Reference Data Keywords • Image Quality Keywords • Add Control Keywords information about the software used for each test. Rosa Diaz & Rusty Whitman

  4. Extending the set of header keywords • Complete set of header keywords allow easy identification of the data for any JWST science/calibration work or analysis. • Description of the detector setting • Description of the ground test setup • Environment • Optical Ground Support Systems • Description of ground test steps • Add non-engineering information to the data • Uniformity across instrument is efficient • Unique keyword to provide specific information • Keywords understood by different instruments Rosa Diaz & Rusty Whitman

  5. Add Instrument Specific Keywords Rosa Diaz & Rusty Whitman

  6. Optical Ground Support System keywords Rosa Diaz & Rusty Whitman

  7. Course of action • Identify relevant header keywords from available test data (MIRI, NIRcam) • First round of input from instrument teams • Extended set of header keywords • Input from instrument teams • Add new keywords to FITSWriter • Provide information about APID • Provide telemetry mnemonics Rosa Diaz & Rusty Whitman

  8. Adding Engineering Data via the FITSWriter • FITSKeyword.xml contains both the definitions for Engineering FITS keywords and a list of engineering telemetry items to be put in the FITS table. • To add a new entry to the table for a detector, insert a new Item Name in the Table Components section for that detector. <TableComponents detector="NRS1"> <ItemName>INRSD_A1_EXPOSURESTATUS </ItemName> </TableComponents> Rosa Diaz & Rusty Whitman

  9. Adding an Engineering Keyword • Update the Keyword List section of the FITSKeyword.xml • The value selected for a keyword will be taken from the first occurrence of the telemetry item found within the time range of the exposure. <Keyword header="allInstrExt"> <Title>NRS exposure status</Title> <Description>Exposure status from packet 0x23a </Description> <ValueSource>INRSD_A1_EXPOSURESTATUS</ValueSource> <DefaultValue>UNKNOWN</DefaultValue> <FITSComment>NIRSpec ASIC1 Information about current frame: </FITSComment> <FITSName>EXPSTAT</FITSName> <FITShdu>primary</FITShdu> <FITStype>string</FITStype> </Keyword> Rosa Diaz & Rusty Whitman

  10. Rosa Diaz & Rusty Whitman

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