Hubble Space Telescope COS filenames

COS filenames

Note: The COS files names are all starting with the letter 'L'

Note: The 9th character of an association of simple observation is always '0' at CADC

Note: Please consult the full documentation.

COS data utilizes a modified naming convention from other HST instruments. In, particular COS FUV files can have TWO suffixes. The first suffix identifies the filetype and the second suffix if present identifies the FUV detector segment. For the remainder of this document the use of "suffix" will refer to the first suffix which identifies the filetype and will always include filetypes with the additional FUV segment suffix if they exist.

CADC file names	File Suffix	Description	Units	Type	Access Example
lxxxxxxx_rawaccum.fits	_RAWACCUM.FITS	Raw NUV ACCUM image		RAW	la8p01frq_rawaccum.fits
lxxxxxxx_asn.fits	_ASN.FITS	Association file		RAW	lb2a13030_asn.fits
lxxxxxxx_trl.fits	_TRL.FITS	Trailer file with a historical record of generic conversion processing		RAW	lb2a13zgq_trl.fits
lxxxxxxx_spt.fits	_SPT.FITS	Support, planning and telemetry information		RAW	lb2a13zgq_spt.fits
lxxxxxxx_rawtag_a.fits lxxxxxxx_rawtag_b.fits	_RAWTAG_A.FITS _RAWTAG_B.FITS	Raw FUV ACCUM image		RAW	lb2a13zgq_rawtag_a.fits
lxxxxxxx_corrtag_a.fits lxxxxxxx_corrtag_b.fits	_CORRTAG_A.FITS _CORRTAG_B.FITS	FUV TIME-TAG events list with calibrated values		CAL	lb2a13zgq_corrtag_a.fits
lxxxxxxx_corrtag.fits	_CORRTAG.FITS	NUV TIME-TAG events list with calibrated values		CAL	la8p01frq_corrtag.fits
lxxxxxxx_flt.fits	_FLT.FITS	NUV flat-fielded science image		CAL	la8p01frq_rawaccum.fits
lxxxxxxx_flt_a.fits lxxxxxxx_flt_b.fits	_FLT_A.FITS _FLT_B.FITS	FUV flat-fielded science image		CAL	lb2a13zgq_flt_a.fits
lxxxxxxx_fltsum.fits	_FLTSUM.FITS	Summed flat-fielded image (imaging only). Final calibrated association product for all COS imaging datasets		CAL	la8p011p0_fltsum.fits
lxxxxxxxx_lampflash.fits	_LAMPFLASH.FITS	1-D extracted TAGFLASH (FLASH=yes) spectra		CAL	lb2a13zgq_lampflash.fits
lxxxxxxxx_x1dsum3.fits	_X1DSUM3.FITS	Averaged 1-D extracted spectra for multiple exposures with the same grating, central wavelength, aperture and FP-POS="n"		CAL	lb2a13030_x1dsum3.fits
lxxxxxxxx_x1dsum.fits	_X1DSUM.FITS	Final combined 1-D extracted spectra for multiple exposures with the same grating, central wavelength and aperture combining all FP-POS. Final calibrated association product for all COS spectroscopic datasets.		CAL	lb2a13030_x1dsum.fits
lxxxxxxxx_x1d.fits	_X1D.FITS	1-D extracted spectra for a single exposure		CAL	lb2a13zgq_x1d.fits