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.

TBD

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   Photometric time?
R DARKTIME   TBD
R EXPTIME   TBD
R ELAPSED   Time between resets?
S OBSMODE ‘SLITFLAT Identifier of the observing mode