1. FITS Header Keywords for ground test data
Rosa Diaz
&
Rusty Whitman
June 13, 2008
Rosa Diaz & Rusty Whitman

2. Rosa Diaz & Rusty Whitman
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
June 13, 2008
Rosa Diaz & Rusty Whitman

3. Rosa Diaz & Rusty Whitman
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.
June 13, 2008
Rosa Diaz & Rusty Whitman

4. Rosa Diaz & Rusty Whitman
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
June 13, 2008
Rosa Diaz & Rusty Whitman

5. Rosa Diaz & Rusty Whitman
Add Instrument Specific Keywords
June 13, 2008
Rosa Diaz & Rusty Whitman

6. Rosa Diaz & Rusty Whitman
Optical Ground Support System keywords
June 13, 2008
Rosa Diaz & Rusty Whitman

7. Rosa Diaz & Rusty Whitman
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
June 13, 2008
Rosa Diaz & Rusty Whitman

8. Rosa Diaz & Rusty Whitman
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>
June 13, 2008
Rosa Diaz & Rusty Whitman

9. Rosa Diaz & Rusty Whitman
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>
June 13, 2008
Rosa Diaz & Rusty Whitman

10. Rosa Diaz & Rusty Whitman
June 13, 2008
Rosa Diaz & Rusty Whitman