This archive was created 24th November 2010 and will contain news items older than 45 days of today's date.

7 Nov 2011 All Post-SM4 full frame superbiases have been reprocessed to remove the bias striping, and these are now available for retrieval

03 Nov 2011: Cycle 19 Calibration Plan has been posted on the Calibration Plan site.

20 Sept 2011: ACS is working properly after the SIC & DH lockup that occurred 27 Sept. 2011 05:39 EDT. No science data should be effected.

21 Oct 2011: ACS WFC SuperDarks good through Aug 31st are ready for GO retrieval. ACS WFC subarray superbiases are in production.

18 Oct 2011: ACS WFC Superbiases have been delivered to CDBS and will be ready for GO retrieval within the next 24 hours. These superbiases are good through Sept 1st. Dark reference files will be available by the end of the week. ACS WFC subarray superbiases are in production.

24th Aug 2011:We expect delays in calibration reference file delivery to the MAST archive due to software updates in calacs. Data executed after July 1 2011 are expected to have reference files available by early October.

12 Aug 2011 : Full-frame ACS WFC bias reference files are ready for GO retrieval and are good through July 01 2011. The following subarray reference files have been updated: wfc2-0rampq good through June 07 2011, wfc1-2k good through July 07 2011. More subarrays are in the queue and are to be updated in the near future. Dark reference files are good through July 01 2011.

27 July 2011 ACS ISR "Post-SM4 ACS/WFC Bias Striping: Characterization and Mitigation" (ISR11-05) available via ACS ISR website

12 July 2011 ACS ISR "ACS After Servicing Mission 4: The WFC Optimization Campaign" (ISR11-04) available via ACS ISR website

03 June 2011 ACS ISR "Flux Calibration of the ACS CCD Cameras III. Sensitivity Changes Over Time" (ISR11-03) available via ACS ISR website

28 April 2011 ACS ISR "Flux Calibration of the ACS CCD Cameras II. Encircled Energy Correction" (ISR11-02) available via ACS ISR website

Jan 2011 ACS ISR "Flux Calibration of the ACS CCD Cameras I. CTE Correction" (ISR 11-01) available via ACS ISR website

19 Nov 2010: The ACS team has released new software to perform pixel-based CTE corrections on WFC images and to remove bias striping noise from post-SM4 images. When performing both sets of corrections, the striping noise should be corrected before the CTE.

Resulting documents from the STScI Calibration Workshop held Summer 2010 at STScI are now posted on the Activities Page .

24 Nov 2010 ACS+WFPC2 Analysis Newsletter (STAN) released.

New ISR: An Empirical Pixel-Based Correction for Imperfect CTE. I. HST's Advanced Camera for Surveys by Anderson and Bedin ISR10-03

New ACS WFC IDC Tables Delivered July 23, 2010

08 June 2011 : Delivery of WFC SuperDark reference files are good through April 15th and are available for retrieval. Bias full frame reference files for WFC are good through May 9th 2011. Next Bias and Dark Delivery ~June 22, 2011.