The Advanced Camera for Surveys (ACS) is a third-generation Hubble Space Telescope (HST) instrument. ACS was installed during HST servicing mission 3B. During servicing mission 4, the ACS WFC was repaired after an electronics malfunction in 2007.
Late Breaking News
28 Feb 2019 ISR 19-01 by N. Hathi et al, "The ACS/WFC G800L Grism: I. Long-term Stability" is now posted
20 Dec 2018 ISR 18-09 by J. Ryon et al, "ACS/WFC Parallel CTE from EPER Tests" is now posted
26 Nov 2018 ISR 18-08 by A. Bellini et al, "Focus-diverse, empirical PSF models for the ACS/WFC" is now posted
26 Oct 2018 ISR 18-07 by R.J Avila et al, "Mitigating Elevated Dark Rates in SBC Imaging" is now posted
23 Oct 2018 ISR 18-06 by T.D Desjardins and N.A. Grogin, "Remeasuring the ACS/WFC Absolute Gains" is now posted
28 Sep 2018 ISR 18-05 by N.D. Miles et al, "Updates to the CALACS Cosmic Ray Rejection Routine: ACSREJ" is now posted
30 Aug 2018 ISR 18-04 by J. Anderson and J.E. Ryon, "Improving the Pixel-Base CTE-correction Model for ACS/WFC" is now posted
31 May 2018 ISR 18-03 by S. Hoffmann et al., "A Minor Contamination Event in May 2017 Affecting the ACS/WFC CCD's" is now posted
17 Apr 2018 ISR 17-09 by J. Mack et al, "ACS/WFC Sky Flats from Frontier Fields Imaging." is now posted
29 Mar 2018 ISR 18-02 by N.D. Miles, "Updates to Post-Flash Calibration for the Advanced Camera for Surveys Wide Field Channel" is now posted.
16 Mar 2018 ISR 17-10 by S.E. Deustua and J. Mack, "Comparing the ACS/WFC and WFC3/UVIS Calibration and Photometry" is now posted.
16 Feb 2018 ISR 18-01 by V. Kozhurina-Platais et al, "Accuracy of the HST Standard Astrometric Catalog w.r.t. Gaia" is now posted.
In January of this year, the ACS Team released a version of
CALACS, version 10.0.0, that will be installed with the most recent version of
HSTCAL, v2.0.0, as part of the HSTDP 2018.1 pipeline release.
This version contains all the updates made to
CALACS v9.2.0, in addition to the several improvements made in v10.0.0. This release is the largest since CALACS in HSTDP 2012.2 containing many updates and improvements to the calibration routines used in
Out-dated WebpagesIn light of these updates, the ACS Team is currently working to update all webpages referencing previous versions of
CALACS. This is a work in progress and so whenever possible, we strongly recommend that users refer to the documentation in the most recent version of the ACS Data Handbook (v9.0) published in February 2018. If you are still unable to find an answer to your question, please submit a help ticket at hsthelp.stsci.edu. We apologize for any inconvenience this may cause and thank you for bearing with us.
-The ACS Team
A brief summary of the major updates to
CALACS in v9.2.0 and v10.0.0 are as follows:
Updates in v9.2.0
Updates in v10.0.0
ACSREJ has been fixed
ACSREJ algorithm has been updated to use the ERR arrays when rejecting cosmic rays
Release notes for all
HSTCAL versions are posted in the github repository.
Current ACS Status
SBC is operating nominally.
HRC is not operational.
WFC is operating nominally.