FITS Keywords ============= The FITS keywords used by MEGARA are described in full detail elsewhere (document TEC/MEG/146). In the following sections, we describe the keywords that are used by the pipeline. Primary header -------------- ==== ======== ======================== ============================================ Type Keyword Example Explanation ==== ======== ======================== ============================================ L SIMPLE T Standard FITS format I BITPIX 16 One of -64,-32,8,16,32 I NAXIS 2 # of axes in frame I NAXIS1 2048 # of pixels per row I NAXIS2 2048 # of rows S ORIGIN 'GTC' FITS originator S OBSERVAT 'ORM' Observatory S TELESCOP 'GTC' The telescope S INSTRUME 'MEGARA' The instrument S OBJECT 'NGC 4594' Target designation S OBSERVER 'OBSERVER' Who adquired the data S DATE-OBS '2012-09-20T12:00:11.50' Date of the start of the observation S DATE '2012-09-20T12:14:12.78' Date the file was written ==== ======== ======================== ============================================ Required by the pipeline ------------------------ ==== ======== ======================== ============================================ Type Keyword Example Explanation ==== ======== ======================== ============================================ R AIRMASS 1.1908 Mean airmass of the observation R MJD-OBS 72343.34324 Modified JD of the start of the observation S IMAGETYP 'FLAT' Type of the image S VPH 'LR-R' Type of VPH S OBSTYPE 'SLITFLAT' Type of observation R EXPOSED Exposure time in seconds R EXPTIME Exposure time in seconds (synonim) R DARKTIME TBD S OBSMODE 'SLITFLAT Identifier of the observing mode ==== ======== ======================== ============================================ FIBERS extension ---------------- The state of the focal plane of MEGARA is stored in a dedicated extension names `FIBERS`. This extension contains only headers, the data part will be empty. ==== ======== ======================== ============================================ Type Keyword Example Explanation ==== ======== ======================== ============================================ I NFIBERS 643 Number of fibers I NSPAXEL 644 Number of spaxels I NBUNDLES 92 Number of fiber bundles S INSMODE LCB Name of active pseudo slit S CONFID 'b7d35e7df0274fde..' Unique identificator of the configuration I BUNnnn_P 0 Priority of the target in this bundle S BUNnnn_I 'unknown ' Name of the target S BUNnnn_T 'UNASSIGNED' Type of target ('STAR', 'SKY', 'TARGET', 'UNASSIGNED' I FIBmmm_B nnn ID of the bundle F FIBmmm_D +3.34565 Declination of the spaxel F FIBmmm_R 12.342223 Right Ascension of the spaxel F FIBmmm_O 0.0 Position Angle of the Fiber L FIBmmm_A T Is fiber active? F FIBmmm_X -0.4646226291303512 X position of the fiber in the focal plane F FIBmmm_Y 63.63025 Y position of the fiber in the focal plane ==== ======== ======================== ============================================