The XMM-Newton observatory has released the 24th Announcement of Opportunity (AO 24) to submit proposals for observations to be performed with XMM-Newton.

This Announcement solicits proposals to be carried out between May 2025 and April 2026. Proposers from institutes located worldwide are welcome to participate. All proposals will be subject to peer review by the XMM-Newton Observing Time Allocation Committee.

The detailed schedule of milestones of the announcement, the required software tools and the documentation are available from the AO 24 webpage.

Key milestones for this announcement:

• Announcement of Opportunity 20 August 2024
• Due date for Proposals 11 October 2024 at 12 noon UTC (6a Eastern, 3a Pacific)
• Final OTAC approved program late December 2024

After the cycle of proposal submission and selection, the observation details for successful proposals must be entered into the observatory system. This is done during "Phase II" proposal submission.

The anticipated timeline for that eventual Phase II is:

• Start of Phase II proposal submission 8 January 2025
• Closure of Phase II proposal submission 31 January 2025