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The Fermi Large Area Telescope (Fermi-LAT) 3FHL catalog is the latest catalogof >10 GeV sources and will remain an important resource for the high-energycommunity for the foreseeable future. Therefore, it is crucial that thiscatalog is made complete by providing associations for most sources. In thispaper, we present the results of the X-ray analysis of 38 3FHL sources. Wefound a single bright X-ray source in 20 fields, two sources each in two fieldsand none for the remaining 16. The analysis of the properties of the 22 3FHLfields with X-ray sources led us to believe that most (19/22) are ofextra-galactic origin. A machine-learning algorithm was used to determine thesource type and we find that 15 potential blazars are likely BL Lacertaeobjects (BL Lacs). This is consistent with the fact that BL Lacs are by far themost numerous population detected above >10 GeV in the 3FHL.

Identifying the 3FHL Catalog. IV. Swift Observations of Unassociated Fermi-LAT 3FHL Sources