The DETWIPCS packet

The DETWIPCS packet lists the header items which define the state of the CCD-IPCS detector. The header records should be as follows:

UTSTART =  'hh:mm:ss.ss'     / UT at start of exposure
ELAPSED =  REAL              / Elapsed time (secs)
DARKTIME=  REAL              / Elapsed time (secs)
EXPOSED =  REAL              / Exposure time (secs)
EXPTIME =  REAL              / Exposure time (secs)
BUNIT   =  'Counts'          / Physical units of data array
IPCMODE =  CHAR              / Acquisition mode 
IPCSMODE=  CHAR              / Acquisition sub-mode 
IPCTAG  =  INTEGER           / Computer tag data label 
IPCATAG =  INTEGER           / Auxiliary tag data label
IPCDITHX=  LOGICAL           / X dither enabled ?
IPCDITHY=  LOGICAL           / Y dither enabled ?
IPCSDIST=  LOGICAL           / S-distortion enabled ?
IPCEHTST=  CHAR              / EHT status
IPCEHT  =  REAL              / EHT voltage (keV)
IPCSCURR=  REAL              / Solenoid current (A)
IPCSTEMP=  REAL              / Solenoid temperature (K)
IPCCCD  =  CHAR              / Type of CCD chip
IPCCCDX =  INTEGER           / X size of CCD chip 
IPCCCDY =  INTEGER           / Y size of CCD chip 
IPCCROWS=  INTEGER           / Scan rows read out of the CCD
IPCCXSTA=  INTEGER           / X start for CCD readout
IPCCXSIZ=  INTEGER           / X window size for CCD readout
IPCREADX=  INTEGER           / X size of readout area 
IPCREADY=  INTEGER           / Y size of readout area 
IPCXPIX =  REAL              / X pixel size (micron)
IPCYPIX =  REAL              / Y pixel size (micron)
IPCXRES =  INTEGER           / X resolution factor
IPCYRES =  INTEGER           / Y resolution factor
IPCDATX0=  INTEGER           / X origin of data window
IPCDATY0=  INTEGER           / Y origin of data window
IPCDATXS=  INTEGER           / X size of data window
IPCDATYS=  INTEGER           / Y size of data window
IPCOVER =  INTEGER           / Horizontal overscan  
IPCWNUM =  INTEGER           / Number of windows
IPCW1STA=  INTEGER           / Start of window 1
IPCW1LEN=  INTEGER           / Length of window 1
IPCW2STA=  INTEGER           / Start of window 2
IPCW2LEN=  INTEGER           / Length of window 2
IPCW3STA=  INTEGER           / Start of window 3
IPCW3LEN=  INTEGER           / Length of window 3
IPCW4STA=  INTEGER           / Start of window 4
IPCW4LEN=  INTEGER           / Length of window 4
TRIMSEC =  CHAR              / Exposed area of the image
CCDSEC  =  CHAR              / Position of exposed area on IPCS camera

Notes:

• Some further work will be required on unit conversion in the IPCS D-task to convert information such as acquisition mode into a form likely to be intelligible to observers.

• It is not currently possible to find out both the elapsed time and the exposure time for an IPCS observation. This should be a future upgrade.

• The UT at the start of the exposure is determined from the internal clock of the DMS. This is accurately synchronized with the start of photon counting. However, the clock may not be synchronized with the time service and may be subject to long-term drift. Compare UTSTART with UTOBS to check for drift.

• ELAPSED and EXPOSED are preferred to TIMELAPS and TIMEXPOS for compatibility with AAO. EXPTIME and DARKTIME are also provided for use by IRAF.

• TRIMSEC and CCDSEC should each define a rectangular region by giving the pixel bounds thus: [x1:x2,y1:y2].