Reference files used by the WFC3 calibration pipeline (calwf3 and PyDrizzle/MultiDrizzle) are updated on a regular basis. Current reference files files can be retrieved from the HST archive, or downloaded directly from the iref 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.
To retrieve a file from the archive, click in the file name. For details on how to correctly set up the Archive retrieval options for reference files, check our Help page.
To receive e-mail notifications of deliveries of new reference files, you can subscribe to instrument specific mailing lists. More.New tools for exploring WFC3 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 'wfc3' then select the filetype. Use the names below in the Header Keyword column as a guide.
| Reference File Type | File Suffix | Header Keyword | Detector |
|---|---|---|---|
| Bias Images Additive stationary pattern in the electronic zero point of the CCDs. More... |
BIA | BIASFILE | UVIS |
| Dark Images Additive noise due to thermal effects. More... |
DRK | DARKFILE | Both |
| Flat-Field Images Variations in the sensitivity of the detectors. More... |
PFL | PFLTFILE | Both |
| Linearity Correction Files Non-linearity effects in the IR detector. More... |
LIN |
NLINFILE |
IR |
| Bad Pixel Tables All known permanently bad pixels. More... |
BPX |
BPIXTAB |
Both |
| Detector Characteristics Tables Detector parameters such as readnoise, gain, and bias levels. More... |
CCD |
CCDTAB |
Both |
| Overscan Region Tables Overscan (UVIS) or reference pixel (IR) areas. More... |
OSC |
OSCNTAB |
Both |
| Cosmic Ray Rejection Tables Parameters for performing image stacking. More... |
CRR |
CRREJTAB |
Both |
| MultiDrizzle Parameter Table Input parameters for combining associated exposures. More... |
MDZ |
MDRIZTAB |
Both |
| Pixel Area Correction Tables Map of pixel area variation across the field of view. More... |
PAM |
- | Both detectors |
| Synphot Throughput Files Synphot is the STSDAS synthetic photometry package. More... |
- | - | Both detectors |
| Image Photometry Table Parameters for performing photometry correction More... |
IMP |
IMPHTTAB |
Both |
| Post-Flash Image File Application of a post-flash image. More... |
FLS | FLSFILE | UVIS |
| Detector-to-Image Correction File 2-D look-up table of astrometric corrections for shifts caused by the lithographic-mask pattern More... |
D2I | D2IMFILE | UVIS |
| Non-polynomial Filter Dependent Distortion File 2-D look up table containing the non-polynomial filter-dependent part of the distortion correction. More... |
NPL | NPOLFILE | UVIS |
Tables used to calculate SIP coefficients
(see Drizzlepac/Astrodrizzle Web Pages)
| Reference File Type | File Suffix | Header Keyword | Detector |
|---|---|---|---|
| Image Distortion Coefficient Tables Geometric distortion models. More... |
IDC | IDCTAB | Both |
Currently not supported
| Reference File Type | File Suffix | Header Keyword | Detector |
|---|---|---|---|
| Analog-to-Digital Tables Currently disabled |
A2D | ATODTAB | N/A |