ROSES-25: D.3 XRISM GO Final Text Released; Proposals Due 27 February 2026
16 December 2025
D.3C X-ray Imaging and Spectroscopy Mission (XRISM) General Observer (GO) solicits proposals for participation in the NASA program for the conduct of space science observations using the X-ray Imaging and Spectroscopy Mission (XRISM) and for related supporting atomic physics investigations. XRISM is led by the Institute of Space and Astronautical Science of the Japan Aerospace Exploration Agency (ISAS/JAXA), with significant contributions from NASA and ESA, and over 70 institutions in Japan, the U.S., Canada, and Europe. The primary goal of the XRISM mission is to investigate the nature of astrophysical objects as revealed through detailed observations of their high-energy emission. A broad range of astrophysical sources will be studied, including stars, X-ray binaries, diffuse galactic emission, active galactic nuclei, supernova remnants, and clusters of galaxies.
ROSES-25 Amendment 28 releases final text and due dates for D.3C XRISM GO, which was previously TBD. Both the Type-1 Phase-1 (via ARK RPS) proposals and the Type-2 (NSPIRES) proposals are due 27 February 2026. Revised text includes opportunities for new joint observations with XMM-Newton and NuSTAR, allowing coordinated or simultaneous studies across observatories when scientifically justified. Additionally, time-constrained and Target-of-Opportunity (TOO) observations, up to a combined maximum of 20% of total observing time are also allowed.
Please direct questions concerning D.3C XRISM GO to both Koji Mukai at koji.mukai-1@nasa.gov and Sanaz Vahidinia at sanaz.vahidinia@nasa.gov.
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