As the utility of the existing CCT program reaches its end, we are seeking to replace the CCT with new targets and updated observing configurations. This call requests white papers that motivate lists of astrophysical objects that provide a deep reservoir of targets.

For more information see the full announcement.

9/1/26

After a successful checkout of the HRC shared preamplifiers and processing electronics, the CXC resumed observations with the HRC-I in January, 2026. Investigation of the HRC-S anomaly continues, and submission of HRC-S proposals for Cycle 28 are encouraged.

3/16/26