XMM-Newton Announcement of Opportunity: Policies and Procedures

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3.2 Discretionary Time

The XMM-Newton Project Scientist can grant ``Discretionary Time'', which is $\sim$5% of the XMM-Newton observing time.

Unanticipated Target of Opportunity observations can be executed in the ``Discretionary Time'' of the Project Scientist. The Project Scientist can also use ``Discretionary Time'' to increase observing time of accepted targets. This does not impact on the data rights nor on the proprietary period of the observation.

European Space Agency - XMM-Newton Science Operations Centre