Calibration Reference Data System

Reference files used by the WFPC2 calibration pipeline (CALWP2) have been updated on a regular basis. All available reference files can be retrieved from the HST archive, or downloaded directly from the uref 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.

Each reference file has listed along with it the suggested "use after" date, the camera used and where necessary, the shutter, filter numbers, atodgain, clock, and/or filternames are given as well. The dataname in the table is the rootname of the reference file; the file extensions follow the convention outlined in ICD 47 (Post Observation Data Processing System to Calibration Data Base System Interface Control Document, Chapter 7):

 ASCII header   Binary data   type of reference file 
  ------------   -----------   ----------------------
    .r0h           .r0d        static mask
    .r1h           .r1d        analog to digital converter correction
                               lookup table

    .r2h           .r2d        bias frame
    .b2h           .b2d        bias data quality file

    .r3h           .r3d        dark frame
    .b3h           .b3d        dark data quality file

    .r4h           .r4d        flatfield 
    .b4h           .b4d        flatfield data quality file

    .r5h           .r5d        shutter shading correction

    .r6h           .r6d        (non-pipline) delta darks and correction flatfields
    .r7h           .r7d        WF4 anomaly correction
    .r9h           .r9d        pixel area correction file

New tools for exploring WFPC2 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 'wfpc2' then select the filetype. Use the names below in the Header Keyword column as a guide.