XMM Users' Handbook

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Concatenated observations

Observations are normally concatenated in an attempt to observe an object with different instruments or instrument configurations in a direct series of exposures. Since on XMM all instruments operate simultaneously and because it implies the necessity for special XMM SOC support and a restriction in the schedulability of the observing run, proposing concatenated observations with XMM needs a specific scientific justification and is in general discouraged by the SOC.

European Space Agency - XMM Science Operations Centre