NuSTAR Target of Opportunity (ToO) or Directors Discretionary Time (DDT) observation request

Submit GO requests to NuSTAR operations team for review

Fast ToOs (turnaround <= 48 hours) will only be approved for exceptional scientific opportunities

Approved ToO/DDT observations
Z Cam 40 ksPI Mukai
MAXI J1535-571 5 x 20 ks coordinated with NICER for NuSTAR cycle-3 proposal 03296
and 4 x 25 ks coordinated with Chandra for cycle-19 proposal 19400282
PI Neilsen
CXO J164710.2-455216 100 ks total for joint NuSTAR/Chandra cycle-18 proposal 18500288PI Rea
Kepler SNR 250 ks, to be observed in 2017PI Lopez
Rho Oph 50 ks, to be observed in 2017PI Grefenstette

Please review the NuSTAR schedules for details of upcoming observations and the table of approved ToO programs from the NuSTAR, Chandra, and XMM-Newton GO programs.

Principal requester
Best way to reach me:
24 hr Contact info:
Scientific Justification
Object type:
Triggering an approved GO program: If yes, then give mission and GO proposal number:
Scientific Justification:
Relevant URLs
Justification for this particular target:
Likelihood of detection, duration,
and recurrence of transient behavior:
Response time requested: Examples: < 24 hours , < 48 hours , within 1 week , at directors discretion (DDT)

Note that the majority of approved ToOs have response times within 1 week
Justification for requested response time:
Target details
Target Name
RA (J2000 decimal degrees from 0.0 to 360.0)
Dec (J2000 decimal degrees from -90.0 to 90.0)
from until
Date/time format options are described here. Default is UTC, unless you specify another time zone.
Observing time (kiloseconds)
Justification for observing time
(Give details of any source modeling, particularly for exposure time requests above 50 ks)
Expected NuSTAR count rate
(predicted instrument count rate for both modules using 50% PSF extraction with no dead time)

HEASARC WebPIMMS (set "Into:" field to 'NUSTAR') here.
Maximum expected NuSTAR count rate
(in case of flaring, bursts, etc)
Approximate expected spectrum
Source morphology
Coordination with other observatories?:

Clicking the Submit button sends emails and text messages to the NuSTAR operations team.
A conformation email will be sent to the 'Email:' field at the time of submission.
The request will be reviewed by the NuSTAR PI and the operations team and you will be contacted with a decision to approve or deny the request.