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Amendment 5: Neutron Star Interior Composition Explorer (NICER) science operations suspended, ROSES D.3 program element now data analysis.
The Neutron Star Interior Composition Explorer (NICER), a Principal Investigator (PI)-led NASA Mission of Opportunity in the Astrophysics Explorers Program, is an X-ray experiment on the International Space Station dedicated to high-resolution timing and spectroscopy of rapidly variable X-ray sources in the 0.2–12 keV band. In Cycle 8, NICER General Observer (GO) proposals were solicited for observations with NICER addressing all areas of astrophysics.
On June 17, 2025, NICER science operations were suspended due to a hardware anomaly in the pointing system. The rich trove of data collected by NICER during its 8 years of operations offers the potential for many fruitful science investigations.
ROSES-2025 Amendment 5 announces that science operations have been suspended but that data analysis proposals are being solicited. See Section 6 of D.3 Combined General Investigator General Observer Program (.pdf) on the NSPIRES page for IXPE, NICER, and Swift General Observer.
Programmatic questions concerning NICER may be directed to Roopesh Ojha at roopesh.ojha@nasa.gov. Technical questions concerning this program may be directed to Keith Gendreau at Keith.C.Gendreau@nasa.gov.
