Last Updated: 2020/04/03
Target of Opportunity (ToO) observations of anticipated astronomical events may be proposed for within the NuSTAR Guest Observer (GO) program. Additional opportunities to propose for ToO observations are available through the joint GO programs with Chandra, XMM-Newton, Neil Gehrels Swift Observatory, NICER, and INTEGRAL. The data from ToO observations within GO programs have a 6-month exclusive use period for the PI of the GO program, after which the data will be placed in the NuSTAR public archive.
A full list of approved NuSTAR ToO programs is available on the NuSTAR SOC website.
In addition, the NuSTAR project will consider requests for unanticipated ToO observations for exceptional opportunities. Note that NuSTAR ToO and DDT observation requests will in general not be considered for events or sources that could have been predicted and proposed for in GO programs. This restriction is being imposed as a result of guidance from NASA's 2019 Senior Review.
In particular, requests for observations of the following types of sources and events require special justification describing why the requested observation type could not have been proposed as a GO target:
Please use the web form to submit an unanticipated ToO observation or DDT request:
or to trigger an existing approved GO ToO program. If for some reason the website is unavailable then please email nustar _at_ srl.caltech.edu with your request.