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We propose to perform two 35 ksec ToO follow-up observations of X-ray luminous sources that we identify in association with IceCube cosmic high-energy neutrinos using the AMON multimessenger framework. Since identification of the first probable source of high-energy neutrinos in 2018 the blazar TXS 0506+056 multiwavelength follow-up of IceCube.s neutrino alerts has proven its utility for characterizing multimessenger neutrino and electromagnetic sources and we aim to use this approach to identify more such sources. We will conduct XMM-Newton follow-up studies of counterparts identified via Swift/XRT observations. While capable of rapid response [truncated! Please see actual data for full text]