With a new software release of the GTC Control System that was implemented as of October 2011,
a number of changes to the FITS headers took place. The following table provides a listing and
description of these modifications.
Keyword | Example entry | Comment |
APPLYPRE | true | Reordering applied or not |
ARCHID | 141289 | unique image number |
CD1_1 | 6.15197399589511E-05 | for astrometric calibration, Not yet filled |
CD1_2 | -3.47495197988005E-05 | for astrometric calibration, Not yet filled |
CD2_1 | -3.47495197988005E-05 | for astrometric calibration, Not yet filled |
CD2_2 | -6.15197399589511E-05 | for astrometric calibration, Not yet filled |
CRPIX1 | 462.5 | for astrometric calibration, Not yet filled |
CRPIX2 | 995. | for astrometric calibration, Not yet filled |
CRVAL1 | 328.053157852889 | for astrometric calibration, Not yet filled |
CRVAL2 | 2.41799503858528 | for astrometric calibration, Not yet filled |
CTYPE1 | RA---TAN | for astrometric calibration, Not yet filled |
CTYPE2 | RA---TAN | for astrometric calibration, Not yet filled |
DATE-OBS | 2011-09-27T21:39:31:281 | Time when starts the first exposure |
ELAPSHUT | 1.466 | Total elapsed time |
EQUINOX | 2000. | for astrometric calibration |
EXTNAME | GTC FRAME | Extension written by GTC pipeline |
FILSTAT | COMMITED | ? |
GAIN | 0.95 | Gain (e-/adu) |
GAINTYPE | GAIN_x9_5 | Gain mode requested by user |
GTCPRGID | GTC3-11BIACMEX | Program Id |
HEIGHT | 2348 | Telescope height above sea level (m) |
INSMODE | Instrument Mode | |
LATITUDE | 28762000 | Telescope latitude (degrees), +28:45:43.2 |
LONGITUD | 17877639 | Telescope longitude (degrees), +17:52:39.5 |
LOOPSHIF | 0 | Charge Shuffling: Num times -numshifts- is repeated |
NAXIS1 | 1024 | length of data axis 1 |
NAXIS2 | 2051 | length of data axis 2 |
OBSCLASS | Science | Observation Class |
OBSERVAT | ORM | Observatory (IRAF style) |
ORIGFILE | Oct16_042857.fits | Original file name |
RADESYS | FK5 | for astrometric calibration, Not yet filled |
RSPEED | 200 | Readout Speed Khz; now is a number (was SPEED_200) |
SIMTYPE | 0 | Unknown |
SIMVAL | 0 | Unknown |
TELESCOP | GTC | Telescope |
TFBANDW | 12.4312877655029 | filter bandwidth after offset correction, in Angstrom |
TFID | TF_RED | Tunable Filter identifier |
TFTEMP | TF temperature | |
TFWAVEL | 9127.95339211425 | filter wavelength after offset correction |