Robert C. Byrd Green Bank Telescope
NRAO Green Bank
Mark H. Clark
January 30, 2003
GBT Software Project Note 10.6
The FITS format structure is presented for the GBT IF
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 scan data FITS files contain both 1) a complete description of
the complete IF signal paths for the observation and 2) key parameters
describing the resultant signal at the backend.
- 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).
- 4th December 2001
- Revamped definition for FITSVER 1.1: addition of
keywords FEED and HIGH_CAL are postponed for FITSVERS 1.2 (Mark Clark).
- 23rd March 2002
- Modified to correctly document that all TFORM characters
are preceded by an integer even if 1 (Mark Clark).
- 30th October 2002
- Modified to fully document FITSVERS 1.2, i.e.,
addition of columns for SRFEED1 and SRFEED2 (Mark Clark).
- 30th January 2003
- Modified to fully document FITSVERS 1.3, i.e.,
use of BANDWDTH of zero to denote the IF signal is outside the limits
of the emulation and modifications to prevent the need
of NULLs in such cases as seen in previous versions.
- 3rd April 2008
- Modified to mention FREQOFF offset found in the STATE
table of the LO1 Device FITS file (Bob Garwood).