The SpectralProcessor FITS keywords for the primary HDU conforms to the definition for common FITS headers. Only the keyword MODE is added to identify the overall state. Possible values are:
The primary header keywords are as follows:
SIMPLE = T / file does conform to FITS standard BITPIX = 8 / number of bits per pixel NAXIS = 0 / number of data axes EXTEND = T / FITS dataset may contain extensions ORIGIN = 'NRAO Green Bank' / DATE-OBS='2000-10-25T13:57:17' / Scan Coordinator parameter startTime TIMESYS = 'UTC' / time scale specification for DATE-OBS INSTRUME='SpectralProcessor' / device or program of origin GBTMCVER= '3.3.0' / telescope control software release FITSVER = '1.1' / FITS definition version for this device DATEBLD= 'Thu Jun 7 20:15:13 GMT 2001' / time program was linked SIMULATE= 0 / Is the instrument in simulate mode? TELESCOP= 'NRAO_GBT' / Green Bank Telescope (Robert C. Byrd 100m) OBJECT = '0013+1527' / Scan Coordinator parameter source PROJID = 'RMP_DCR' / Scan Coordinator parameter projectId OBSID = 'test' / Scan Coordinator parameter scanId SCAN = 3 / Scan Coordinator parameter scanNumber MODE = 'StdSpectLine' / Set of quadrants and associated input ports END
As for all GBT scan data FITS files, the DATE-OBS keyword takes the value of the Manager parameter startTime. This is the scheduled start time for the scan as a whole. The actual time at which integrations are taken is recorded in the DATA table; it is possible that there may be some delay between the start of the scan (as recorded in DATE-OBS) and the actual time of the first integration.