The possibility to recommend unanticipated TOO observations is open to all astronomers worldwide. Astronomers who detect a suitable event are strongly encouraged to send a recommendation via the TOO alert page at:
It is expected that an event proposed as unanticipated TOO is a very rare event, specifically, that it is too rare to be reasonably proposed as anticipated TOO, see Section 220.127.116.11.
Receipt of an urgent TOO recommendation immediately initiates the process of a technical review, a decision on whether or not to interrupt the XMM-Newton programme and, if accepted, the observation of the proposed target. For non urgent requests, this process is initiated only at the first next working day after the receipt of the alert at the SOC.
Unanticipated TOO observations are performed under the ``Discretionary Time'' category (Section 3.2) or, if approved by an OTAC chairperson, as ``Open Time'' (Section 3.1). Unanticipated TOO observations which do not violate data rights of accepted proposals may either get half a year proprietary rights or be made public after successful Observation Data File (ODF) generation. The Project Scientist decides about data rights and the proprietary period of data resulting from unanticipated TOO observations. The basis of the decision is the information provided in the alert, as well as the time when it arrived at the SOC.