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Chandra X-ray Center
Chandra Cycle 28 Call for Proposals Released 18 December 2025
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.
Proposals are due:
Wednesday, 18 March 2026 at 6PM (US Eastern Daylight Time)
For more information, see the full announcement.
12/18/25
CIAO 4.18, Sherpa 4.18, CALDB 4.12.3, SAOImageDS9 8.7b2, and MARX 6.0.1 Released
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.
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
HRC Anomaly Notice
On the evening of October 24th during a real time contact in which the
HRC-S was scheduled to be observing V1935 Cen, the HRC team noted that
the HRC-S High Voltage Power Supply was OFF, when it should have
been ON. This anomalous detector state led the team, in consultation
with the Flight Director and Lead Systems Engineer, to manually command
the HRC into a safe state. All other spacecraft and detector telemetry
appeared nominal at the time. The HRC remains inactive while the
instrument and operations teams diagnose the issue.
11/4/25
