XMM-Newton Announcement of Opportunity: Policies and Procedures

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3 Observing Time

About 90% of XMM-Newton's observing time is made available via Announcements of Opportunity, which are open worldwide. In addition to this ``Open Time'', there is ``Calibration Time'', and Project Scientist's ``Discretionary Time''.

This Announcement solicits proposals to be carried out in the period defined in Section 1. All available ``Open Time'' of this period is distributed via this call, which results in $\sim$14.5 Ms total observing time per year.

``Open Time'' observations resulting from this Call for Proposals will be interleaved into the observing schedule, together with a few observations which failed or were not performed during the time period allocated to previous Announcements of Opportunity. A few observations approved in this call may be scheduled outside of the above period, depending on the visibility and science aimed.


European Space Agency - XMM-Newton Science Operations Centre