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19-August-2025
Dear Colleague,
NASA is pleased to call to the attention of members of the U.S. scientific community the release by the European Space Agency (ESA) of the Announcement of Opportunity (AO), "XMM-Newton Call for Observing Proposals", soliciting Guest Observing proposals for
the 25th cycle (AO-25) observing program for ESA's X-ray Multi-Mirror Mission (XMM-Newton). The subject Announcement solicits proposals for observations to be performed during a 12-month period commencing in May 2026. Due to the nature of the NASA-ESA bilateral
agreement, only proposals from scientists affiliated with U.S. institutions are solicited by this Letter; others are advised to contact ESA directly. U.S. scientists may propose either as Principal Investigators or as Co-Investigators on proposals with either
U.S. or non-U.S. (foreign) PIs. However, only U.S. PIs will be able to receive funding, which is contingent on federal budget decisions and is uncertain at this time.
The AO may be accessed directly from ESA at the following address:
The XMM-Newton Guest Observer Facility (GOF) at the Goddard Space Flight Center (GSFC) is the support center for XMM-Newton activities in the U.S. Information of interest to U.S. observers, as well as general project information, can be found at the following
address:
A detailed description of the mission, including instrument capabilities and additional information pertaining to the proposal preparation and submission procedures, is also available via links from the XMM-Newton home page at that address. (General questions
concerning XMM-Newton and participation by U.S. investigators should be addressed to xmmhelp@athena.gsfc.nasa.gov.) ESA will be responsible for conducting a peer review of all submitted proposals, including those from U.S. investigators, and determining the
associated time allocation. Current plans call for ESA to notify proposers and NASA of the results of the peer review in mid-December 2025.
For additional technical or programmatic information regarding U.S. participation in the XMM-Newton mission, please contact:
Technical Information:
Dr. Kim Weaver
Goddard Space Flight Center
Code 662
Greenbelt, MD 20771
Programmatic Information:
Dr. Pablo Saz Parkinson
Program Scientist
SMD – Astrophysics Division
Mary W. Jackson NASA HQ Bldg
300 Hidden Figures Way SW
Washington, D. C. 20546
Cell: +1 (831) 226-9582
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