The CXC is pleased to announce the release of the Chandra Cycle 28 Call for Proposals (CfP). The Call for Proposals, Proposers' Observatory Guide (POG), proposal planning software, and general information are posted on the "Proposer" web page.

Proposals are due:
Wednesday, 18 March 2026 at 6PM (US Eastern Daylight Time)

For more information, see the full announcement.

12/18/25

The Chandra X-ray Center (CXC) is pleased to announce the release of the following new software packages:
CIAO 4.18
Sherpa 4.18
CALDB 4.12.3
SAOImageDS9 v8.7b2
MARX 6.0.1

For more information, see the full announcement.

12/16/25