Second Announcement of Opportunity

In consideration of ESA’s contribution to XRISM, not less than 8% of the total Guest Observing Time, or an equivalent return as mutually agreed, shall be allocated to ESA. The ESA Director of Science has thus issued the invitation to submit Guest Observer proposals: Letter by ESA Director of Science. Cycle 2 will commence on or about 1 November, 2025, and last for a period of approximately 6 months until on or about 1 May 2026.

The instructions to submit proposals are summairsed in the Announcement of Opportunity for the XRISM GO program and the The XRISM Proposers’ Observatory Guide.

Submit your proposal before 2025 May 15: https://xrismrps.esac.esa.int/ark/

Addtional information

• Further information about XRISM can be found in this XRISM Quick Reference guide.
• Information for studies of feasibility can be found under XRISM Proposal Tools
• Response files for Cycle 1 assuming the Resolve Gate Valve Closed
• Documentation and resources are available here: https://heasarc.gsfc.nasa.gov/docs/xrism/proposals/
• The terms under which personal data are collected with the purpose of processing the proposals can be found under this: Privacy Notice
• For any questions, the European community is encouraged to make use of the European XRISM User Support Portal.