NuSTAR Guest Observer - Cycle 6 (ROSES 2020)

Funding Agency:
National Aeronautics and Space Administration

The Nuclear Spectroscopic Telescope Array (NuSTAR) Small Explorer (SMEX) mission is the first orbiting telescope to focus light in the high energy X-ray region of the electromagnetic spectrum (E > 10 keV), with an effective bandpass of 3–79 keV. The observatory provides a combined improvement in sensitivity and spatial/spectral resolution by factors of 10 to 100 over previous missions that have operated at these energies. The NuSTAR General Observer (GO) Program solicits proposals for basic research relevant to the NuSTAR mission. 

NuSTAR Cycle 7 will commence on or about June 1, 2021, and last for a nominal period of 12 months. Based upon the outcome of the 2019 NASA Astrophysics Senior Review process, NuSTAR operations are currently funded through September 30, 2022. Further details on the Cycle 7 program may be found on the NuSTAR GO Program website (

Observing time will be made available to scientists at both U.S. and non-U.S. institutions. Individuals may submit proposals for three general types of observations: "standard-mode", "Target-of-Opportunity" (ToO, see Section 1.3.4), and "Large Programs" (LP, see Section 1.3.5). In addition to proposals for ToO observations submitted in response to this program element, unsolicited requests for ToO observations may be made through the NuSTAR Science Operations Center. Note that unsolicited ToO requests are ineligible for funding under the NuSTAR GO Program. The data from NuSTAR observations selected under this ROSES program element will have a limited exclusive-use period dependent upon the observation type. Data from approved standard-mode GO and LP observations will have a nominal one-year exclusive-use period commencing at the time of the availability of the processed data to the observer. Data from approved ToO observations will have a corresponding sixmonth exclusive-use period. Note that Principal Investigators (PIs) may waive the exclusive-use period and opt for the observation(s) to be placed directly into the NuSTAR public archive. Data resulting from unsolicited ToO requests will have no exclusive-use period.

Deadline for Proposals: Jan. 22, 2021

Agency Website

Funding Type





Engineering and Physical Sciences
Environmental & Life Sciences

External Deadline

January 22, 2021