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Robert C. Byrd Green Bank Telescope

NRAO Green Bank

Toney Minter Richard Prestage

17th October 2002
GBT Software Project Note 8.5

GBT GO FITS File Specification

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The FITS format structure is presented for the GBT GO (Observer's User Interface) scan data files. The scan data FITS files are permanently archived after each observation, and will usually be input to the aips++ filler, which has the task of combining all scan data FITS files into an aips++ Measurement Set. This data may then either be processed further in aips++, or written out in an aips++ supported FITS format (one of which is single dish FITS).

The contents of the GO FITS file are intended to be indicative of the observer's intent when performing an observation comprised of a sequence of scans. They are not intended to provide detailed data processing information; this should be obtained from the other FITS files associated with each scan.


8th November 2001
Penultimate definition of FITSVER 1.1; released for general comment (Richard Prestage).

16th November 2001
Final version agreed for implementation of FITSVER 1.1. Added history. Subsequent changes to the content of this document should increment the document version number (Richard Prestage).

28th November 2001
Removed SlewTo and Peak from the list of possible PROCNAME values. Changed unknown to Unknown in the possible PROCNAME values. In the example for the FITS Keywords for positional information changed COORDSYS to have a legal value. Put in the correct glish shell function used to determine the value of DATEBLD.

7th March 2002
Add PSWITCH as possible value for SWSTATE keyword. Also added description for each possible SWSTATE value and changed list to be an itemized list. Remove SWWCAL and SWNOCAL as possible values for SWTCHSIG. Add FSW01, FSW12, FSW0102, BEAMSW, POLSW, FSW01NOCAL, FSW12NOCAL, FSW0102NOCAL, BEAMSWNOCAL and POLSWNOCAL as possible values for SWTCHSIG. Change references for switching signals documentation from note by Ron Maddalena to the GO Design Document and the GO Switching Signals Implementation document. Change to FITSVER 1.2.

21st March 2002

17th October 2002
Add nod to list of possible procedures.

12th January 2007
Fix bug so that all RA positions are written in degrees. Change to FITSVER 2.6. Change will appear in M&C version 7.1.

2nd May 2007
Reworded frequency related section to refer to LO1 FITS documentation. FITSVER was not changed.

14th May 2010
Change to FITSVER 2.7. Added RESTFRQn keywords to record all user-suppplied rest frequencies as keyword=value pairs. They have been available in the HISTORY for some time.

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Bob Garwood