Calibration Database System

Reference files used by the STIS calibration pipeline (CALSTIS) are updated on a regular basis. Current reference files can be retrieved from the HST archive, or downloaded directly from the oref directory. Note that FTP access is browser dependent: Safari does not work; Firefox or Chrome may or may not work depending on the Operating System. If you cannot download the files via Firefox or Chrome, you can try using a standalone FTP tool or accessing the ftp site directly (ftp ftp.stsci.edu) with 'anonymous' (without quotes) as your username and your email address as your password.

If you would like to receive an e-mail every time a new STIS reference file is delivered and the database is updated, you can subscribe to the stis_reffiles_upd mailing list. To subscribe to this list, send an e-mail to MajorDomo @ stsci.edu with the following in the body of the message:
subscribe stis_reffiles_upd your_address .

New tools for exploring STIS Reference Files are now available at https:/hst-crds.stsci.edu. To get a listing of the reference files you're interested in, click on 'stis' then select the filetype. Use the names below in the Header Keyword column as a guide.

Image Reference Files

Reference File Type	Extension	Header Keyword	Detector
Bias Image File Image of the additive stationary pattern in the electronic zero point of the UVIS CCDs. More...	bia	BIASFILE	CCD
Dark Image File Image of the signal detected in the absence of photons from the sky. More...	drk	DARKFILE	Both
Pixel-to-pixel Flat Image File Relative variations in pixel-to-pixel sensitivity of the detector. More...	pfl	PFLTFILE	Both
Delta Flat Image File Changes to the small scale flat field contained in the PFLTFILE. More...	dfl	DFLTFILE	N/A
Low-order Flat Image File A map of the large scale variations in the sensitivity across the detector. More...	lfl	LFLTFILE	Both
Shutter Shading Correction Image File Correction for shading caused by the CCD shutter during very short exposures. More...	ssc	SHADFILE	N/A
Small Scale Distortion Image File Correction deltas for small scale detector distortions. More...	ssd	SDSTFILE	N/A

Table Reference Files

Reference File Type	Extension	Header Keyword	Detector
Analog-to-Digital Correction Table Corrections to assigned DN Values. More...	a2d	ATODTAB	N/A
Aperture Description Table Geometric description of the apertures and their offsets (in arcseconds) from a reference aperture. More...	apd	APDSTAB	Both
Aperture Throughput Table Wavelength-dependent transmissions for each aperture with respect to a reference aperture. More...	apt	APERTAB	Both
Bad Pixel Table Table of all known permanently bad pixels. More...	bpx	BPIXTAB	Both
CCD Parameters Table CCD operating parameters, indexed on the readout amplifier. More...	ccd	CCDTAB	CCD
Cosmic Ray Rejection Parameters Table Parameters used in cosmic ray rejection algorithm. More...	crr	CRREJTAB	CCD
Dispersion Coefficients Table Coefficients to the nominal dispersion solution to be applied to extracted 1-D spectra. More...	dsp	DISPTAB	Both
Grating-Aperture Correction Table Correction vectors for the 52X* and 52X*E1 apertures when used with the G230LB, G430L, and G750L gratings. More...	gac	GACTAB	CCD
Incidence Angle Correction Table Coefficients to fits of the change in two dispersion coefficients as a function of angular offset from the reference position. More...	iac	INANGTAB	Both
Image Distortion Correction Table A set of world coordinate information and fits to a distortion function. More...	idc	IDCTAB	Both
Image Photometry Keyword Table Provides pre-computed photometric keywords. More...	imp	IMPHTTAB	Both
MAMA Linearity Table Global and local count rate limits in the nonlinearity correction. More...	lin	MLINTAB	MAMA
Calibration Lamp Table Spectra of the calibration lamps obtained at each of the operating currents. More...	lmp	LAMPTAB	Both
MAMA Offset Correction Table Coefficients to fits of the change in the dispersion coefficients as a function of commanded offset from the reference position. More...	moc	MOFFTAB	MAMA
Photometric Correction Table Correction factors for PHT. More...	pct	PCTAB	Both
Photometric Conversion Table Throughput of the instrument configuration as a function of wavelength, assuming an infinite aperture. More...	pht	PHOTTAB	Both
2-D Spectrum Distortion Correction Set of world coordinate information used to construct rectified, linearized 2-D spectra. More...	sdc	SDCTAB	Both
Cross-Disperser Scattering Table Area-normalized scattering profiles. More...	cds	CDSTAB	MAMA
Echelle Scattering Table Area-normalized scattering profiles for STIS echelle gratings, as a function of offset measured in low-resolution MAMA pixels. More...	ech	ECHSCTAB	MAMA
Echelle Cross-Dispersion Scattering Table Area-normalized profiles describing smearing of echelle scattered light in the cross-dispersion direction. More...	exs	EXSTAB	MAMA
Detector Halo Table Volume-normalized detector halo images at one or more reference wavelengths for each echelle grating. More...	hal	HALOTAB	MAMA
Echelle Ripple Table Peak-normalized ripple (or blaze) functions for echelle gratings. More...	rip	RIPTAB	MAMA
Scattering Reference Wavelength Table Halo reference wavelengths and PSF reference wavelengths used for correcting the two-dimensional effects of scattered light. More...	srw	SRWTAB	MAMA
Telescope Point Spread Function Table Volume-normalized telescope PSF images at several reference wavelengths. More...	tel	TELTAB	MAMA
NUV Dark Correction Table Time- and temperature-dependent characterization of the global rate of dark counts. More...	tdc	TDCTAB	NUV-MAMA
Time Dependent Sensitivity Files Measures the change in the sensitivity of the detectors with time. More...	tds	TDSTAB	Both
Wavecal Parmeters Table Parameters which control the wavecal processing. More...	wcp	WCPTAB	Both
1-D Spectrum Trace Table Displacements of spectra along Axis2 for determining the location of a spectrum prior to extracting the 1-D spectrum. More...	1dt	SPTRCTAB	Both
1-D Extraction Parameters Table The apertures (or "boxes") and methods used in the extraction of 1-D spectra. More...	1dx	XTRACTAB	Both