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.
If you would like to receive an e-mail every time a new WFC3 reference file is delivered and the database is updated, you can subscribe to the wfc3_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 wfc3_reffiles_upd your_address .
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 |