Guide to NuSTAR Cycle 4 Proposers
Table of Contents
This Announcement of
Opportunity (AO) solicits Guest Observer proposals
for NuSTAR. Approximately 6.5 Ms of time will be available
in the observing period June 1, 2018 - May 31, 2019. $2.0M in
funding will be made available to support the analysis of targets
accepted at priority A, B or C . Priority C targets will be observed
on a "best-effort" basis. Target proposals will be considered from
both US and foreign PIs.
Data from approved GO observations, with the exception of Target of Opportunity (ToO) observations,
have a nominal one-year exclusive-use period commencing at the time of receipt of the
processed data by the observer.
Data from peer review approved ToO observations have a six-month exclusive-use period.
Only PIs affiliated with, and located at,
a US institution will be eligible for funding for accepted
NuSTAR proposals through NASA. As part of the NuSTAR Cycle 4 program, up to 1.5 Ms
of XMM observing time and up to 300 ks of Swift observing time will be made available for
coordinated observations with NuSTAR.
Proposals are due no later than
4:30 pm EST on Friday, January 19, 2018.
Joint Observing with Swift
Proposals for joint NuSTAR/Swift programs will be accepted up to a total of 300 ksec of Swift observing time. Joint proposals must provide a compelling justification of the need for both the NuSTAR and Swift data for achieving the primary science goals and receive a Category A or B rating to be considered for acceptance. Proposers are strongly encouraged to carefully read the Swift/NuSTAR memorandum of understanding.
Additional details concerning Cycle 4 are given in the NuSTAR AO.
There will be a two-phase proposal process. Phase one is for observing proposals. Phase two is for budget proposals for successful phase one proposers who were awarded priority A or B targets. Only observing proposals will be accepted at this time.
Proposal submission is done via the HEASARC ARK/RPS on-line system. Hard-copy submission is not required. The following
elements are required:
- Proposal form (cover page & general form, and one or more
pages of the Target form) generated by, and submitted through, ARK/RPS.
- Scientific justification in PDF format, not exceeding 4
pages for a proposal, to be uploaded through ARK/RPS.
The following should not be submitted:
- The PI's institution's own cover page.
- Supporting material (e.g., Curriculum Vitae, pending/current support).
- Formatted electronic copies of the ARK/RPS form.
- Hard copies of any of the above, including electronically
New NuSTAR PIs must first create an ARK
account and/or join the NuSTAR RPS group. Having done so,
the NuSTAR RPS form can be accessed via
We provide below some key details for NuSTAR Cycle 4.
For further details, consult the
ARK/RPS help file.
- Cover Page
- Institutional endorsement is not required by NASA in NuSTAR
phase 1 proposals. Use the endorsement-related entries only if
they are required or desired by the PI's institution.
- In addition to investigations utilizing NuSTAR observations only, proposals involving coordinated observations with the XMM-Newton observatory and/or Swift observatory can also be proposed during Cycle 4. Proposals for joint NuSTAR-XMM or NuSTAR-Swift observations should be indicated by clicking the Joint proposal section of the ARK/RPS form, and inputting the requested XMM and/or Swift exposure time in each target form.
Proposers may submit the same proposal to XMM AO-17 and NuSTAR Cycle 4. However, the XMM-Newton AO-17 approved program will be taken into account during the NuSTAR Phase 1 review and duplicate observations of the same targets by NuSTAR will typically not be awarded. Similarly, Proposers
may submit the same proposal to Swift AO-14 and NuSTAR Cycle 4. However, the Swift AO-14 approved program will be taken into account during the NuSTAR Phase 1 review and duplicate observations of the same targets by NuSTAR will typically not be awarded.
- Joint proposals for NuSTAR observations with Chandra or Integral cannot be submitted in response to this AO. However, NuSTAR does have separate agreements with Chandra and Integral for coordinated observations. Please see the main Proposals and Tools page for more information.
- General Form
- To facilitate checking for conflicts of interest during the peer review process, the co-I's institution must be chosen from the menu (thereby enforcing a uniform set of names). Please check the list of institutions and contact
the RPS team as soon as possible if your co-I's institution is not on this
- Up to 25 co-investigators can be entered into the RPS form. Only the first 10 will appear on the PDF versions of the form. The full list will
be available for conflict checking and will be provided to proposal reviewers.
- Note that bilateral collaborations between scientists affiliated with institutions from the USA and the People's Republic of China (PRC) are not allowed by United States Federal law. Multilateral collaborations that involve scientists from institutions in the USA, the PRC, and other countries are allowed, however. Please refer to the PRC FAQ for ROSES for details.
- Target of Opportunity (ToO) proposals will be accepted in response to this AO.
- Target Form
- Time Constraints: A target is considered as "Time Constrained" if any of the following sections of the target form are marked as 'Yes':
See the NuSTAR RPS help page for more information about these fields.
In addition, observations coordinated with other ground- or space-based
observatories are considered as time constrained.
- Position angle dependent
- Moving Object
- Monitoring Program
- Phase Dependent
- Time Constrained
Note that time-constrained observations designated Category A or B will be given highest priority for scheduling during Cycle 4. Time-constrained observations of Category C targets will be executed on a best-effort basis. Time-constrained Category A and B observations not scheduled during Cycle 4 may be carried over to Cycle 5 where warranted by scientific or operational circumstances (e.g., in the case of coordinated observations with other space- or ground-based observatories). Category C time-constrained observations not scheduled during Cycle 4 will not be carried over to Cycle 5.
- Proposers should include a summary of details that are
necessary for scheduling and observation planning (constraints,
observing mode) in the Remarks box for each
- Sources with fluxes > 10-11 ergs s-1
cm-2 within 5° of the target may cause increased non-uniform
background gradients due to stray light. Users should check observations for
potential stray light contributions using the tool that is available
at the NuSTAR
SOC web site. If a field is designated as having a "Potential stray light issue", proposers should submit a request for a feasibility analysis to firstname.lastname@example.org at least 2 business days prior to the proposal submission deadline.
- The minimum exposure for NuSTAR targets is 20 ks. If the proposer is also requesting XMM and/or Swift time, the minimum exposure time is 5 ks and 1ks, respectively.
- Estimated Count Rates:
Expected total band (3-79 keV) count rate of the source in counts/second for both modules in a 50% PSF extraction with no deadtime.
Note that the time available for observations of bright sources (100 counts/second) is limited to 1 Msec.
- Target of Opportunity (ToOs):
A total of up to 500 ks of NuSTAR Cycle
4 observing time will be made available for proposals to observe ToOs.
For ToO observations that are to be triggered from a class of objects
or from a sample of potential targets: Complete one target form per
trigger only, specifying "0.0" for both the R.A. and Dec. fields, and,
if applicable, enter a list of target names in the TOO Remarks field.
If the list of targets is too long to fit in the TOO Remarks field, include the complete list in the scientific justification instead and put a note in the TOO Remarks to look there for the list.
Remember that ToO proposals will not be accepted for either a core
collapse supernova in the Local Group or a Type 1a closer than the
Virgo Cluster. Also note that it is the responsibility of the PI of an
accepted ToO proposal to alert the NuSTAR SOC when the trigger
conditions for their accepted ToO have been satisfied (via
http://www.nustar.caltech.edu/page/too_policy). For more details see
AO section 1.3.3.
After completing all fields for a proposal in ARK/RPS, use the
Verify button to confirm
that all required entries exist and conform to the expected format.
Forms that pass verification can then be submitted. ARK/RPS allows
PIs to continue to modify submitted proposals
until the deadline, so there is no penalty for submitting the proposal
The LaTeX, PostScript, and PDF buttons of
ARK/RPS can be used to generate formatted versions of the proposal forms.
Although it is often useful for the PIs to keep formatted copies of the forms
for the record, it is not a required part of the proposal submission process.
- The scientific justification for a program must not exceed
4 Letter size pages.
- Proposals must use a font having no more than 15 characters per inch (horizontally), typical of font Times New Roman 12. The scientific justification can be
generated using the software of the PI's choice, as long
as it is converted to PDF format before submission.
- We suggest that proposers use the LaTeX template or
the Word template for the scientific justification. When
using these templates, the user should double-check that the top, botton, right
and left margins are at least 1 inch.
- Proposals should include a description of the scientific
objectives; justify the choice of target(s); show that existing
data (previous X-ray observations or at other wavelengths)
are insufficient to achieve the objectives; justify the choice
of NuSTAR over other existing observatories (preferably
linked to some unique characteristic of NuSTAR);
and demonstrate the feasibility of the proposed observation
- Proposals for targets already observed by NuSTAR are
allowed, but must include a justification for an additional
observation, such as a much longer exposure, different pointing
position within an extended object, or different observing window for a
variable object. Observed and/or approved NuSTAR
targets can be found using the HEASARC/Browse
numaster table or by using NuSTAR
- Conflicts with Legacy Survey Targets
Observations of targets accepted through the Cycle 4 Call for Proposals will take precedence over legacy program observations of those targets. The status of legacy survey target observations can be found in HEASARC's numaster table by selecting "EGS", "ELS" or "GLS" for the obs_type keyword.
- A list of approved NuSTAR ToO programs in the NuSTAR, joint NuSTAR/XMM and joint NuSTAR/Chandra
GO programs can be found on the
NuSTAR SOC page.
- The length of the observation should be justified based on the
specific scientific objectives, preferably using simulations or
scaled from prior NuSTAR observations of a similar source.
However, the minimum NuSTAR observing time for a target is
set at 20 ksec.
U.S. PI's whose Phase-1 proposals are assigned a Category A/B/C rating by the peer review panel will be invited to submit a Phase-2 (cost) proposal. Subject to acceptance of the associated Phase 2 cost submission, proposals for standard-mode observations (excluding proposals involving ToO or time-constrained observations) assigned a Category A or B rating will be eligible for funding immediately. Due to the uncertainty of their execution, the remaining accepted Phase 2 proposals will become eligible for funding only after the proposed observations have been carried out.
US co-Is on proposals with non-US PIs are
not eligible for funding.
Phase 2 (budget) proposals are submitted
through NASA's NSPIRES system.
If you have any questions concerning
NuSTAR or the NuSTAR GO program, visit the Feedback form.