XMM-Newton Announcement of Opportunity: Policies and Procedures

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5.2.2 Targets of Opportunity

Targets of Opportunity (TOOs) are astronomical events observable by XMM-Newton, which cannot be predicted and scheduled on the time scale of a year, yet are scientifically sufficiently important to justify interrupting the overall XMM-Newton programme. Because these events often need rapid reaction times, TOO can only be observed on a best effort basis. The overall responsibility lies with the Project Scientist, who may coordinate his decision with a chairperson of the OTAC. The Project Scientist makes the decision for an interruption of the programme.

The XMM-Newton project recognizes two kinds of TOOs: anticipated and unanticipated TOOs, that are described in the following sections:


European Space Agency - XMM-Newton Science Operations Centre