STScI Calibration Data System

WFC Bias Page

As of 8 Oct 2004, we began producing a bi-weekly WFC superbias. We also began identifying bias structure (with flag 128) in their data quality [DQ] arrays. Prior to this date, we had been producing weekly WFC superbiases, with no flagging in the DQ array (the only bias structure flagging was from the bad pixel table, which has now been discontinued).

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.

See the reference file delivery logsheet for more information. These files can also be downloaded directly from the jref directory. If you choose to access the files via this ftp server, keep in mind that there is a known bug in trying to access files via ftp server using Safari. The recommended browser is Firefox.

As of March 9, 2006 the anneal date information is provided in the Comments column of this table. For information on the anneal dates before this date, please refer to the old ACS WFC Bias Reference Images web page.



Biases for Post-SM4 (May 2009, Side 1) Observations Using Sub Array Combinations


Biases for Post-SM4 Observations (May 2009, Side 1) Using Non-default Amplifier Combinations


Biases for Observations Taken Between July 2006 and April 2009 (Side 2 Operations) Using Non-default Amplifier Combinations


Biases for Post-SM4 (May 2009, Side 1) Full Frame, Four-Amp Readout, Standard Gain Observations


Biases for Full Frame, Four-Amp Readout, Standard Gain Observations Taken between July 2006 and April 2009 (Side 2 Operations)


Biases for Observations Taken Prior To July 2006 (Side 1 Operations)