Photometric Calibration by Time

File Format: FITS binary table

Name:, where rrrrrr is the imaging run number and c is the column location in the Imaging Array of the CCD which acquired the data (1-6).

Produced by: ps

Used by: ps (used in case no calibrated MT patches exist as input), frames

Size: 8640 bytes per file. 1 file for a single postage stamp pipeline run.

Archived? Yes


Photometric calibrations as a function of time. There is one time-stamped photometric calibration for every calibration patch intersected by the run for which processed MT data exists. The time-stamp indicates the time at which the calibration patch was observed by the Imaging Camera during this run.

The "KALXX_ID" keywords identify which secondary patches are used. If, for example, 3 patches were used, then the keywords "KAL01_ID", "KAL02_ID", and "KAL03_ID" must be present. Each such keyword identifies one patch, and should have a value of the form "XXXXX:YYYYY", where "XXXXX" is the sequence ID for the patch (i.e., the sequence ID recorded in the observing log for the frames from which the data came), and "YYYYY" is the unique ID for the Kali run which produced the calibrated data. A sample keyword would look like:

    KAL01_ID= '14653:1998-11-14T14:21:27 25387'

Primary Header

SIMPLE  =                    T
BITPIX  =                    8
NAXIS   =                    0
EXTEND  =                    T
VERSION = 'XXX     '           / Version of software used.
RUN     =                  XXX / Imaging run number.
SSC_ID  = 'XXX     '           / SSC pipeline run identifier.
ASTRO_ID= 'XXX     '           / Astrometric pipeline run identifier.
BIAS_ID = 'XXX     '           / Bias pipeline run identifier.
PS_ID   = 'XXX     '           / Postage stamp pipeline run identifier.

EXCAL_ID= 'XXX     '           / Excal pipeline run identifier (optional).
KALXX_ID= 'kali_id'            / Kali pipeline run identifier for patch XX
CAMCOL  =                  XXX / Column in the imaging camera.
FILTERS = 'XXX XXX ...'        / Filter order in array fields

Table Header

There is one HDU of this format per file. There is only one entry for each calibration patch intersected by the run for which processed MT data exists. The order of the filters in each row is the same as the order of filters in the PDU keyword FILTER.

BITPIX  =                    8
NAXIS   =                    2
NAXIS1  =                   48
NAXIS2  =                  XXX
PCOUNT  =                    0
GCOUNT  =                    1
TFIELDS =                    3

TFORM1  = '1D      '          
TTYPE1  = 'mjd     '           / MJD time at which this calibration applies.
TUNIT1  = 'MJD     '          
TFORM2  = '5E      '          
TTYPE2  = 'flux20  '           / Flux for a 20th mag (above atmosphere) object.
TUNIT2  = 'counts  '          
TFORM3  = '5E      '          
TTYPE3  = 'flux20Err'          / Flux for a 20th mag (above atmosphere) object. 
TUNIT3  = 'counts  '