CHANDRA X-RAY OBSERVATIONS OF THE TWO BRIGHTEST UNIDENTIFIED HIGH GALACTIC LATITUDE FERMI-LAT γ-RAY SOURCES.

We present Chandra ACIS-I X-ray observations of 0FGL J1311.9–3419 and 0FGL J1653.4–0200, the two brightest high Galactic latitude (|b| >10°) γ-ray sources from the three-month Fermi Large Area Telescope (LAT) bright source list that are still unidentified. Both were also detected previously by EGRET, and despite dedicated multi-wavelength follow-up, they are still not associated with established classes of γ-ray emitters like pulsars or radio-loud active galactic nuclei. X-ray sources found in the ACIS-I fields of view are cataloged, and their basic properties are determined. These are discussed as candidate counterparts to 0FGL J1311.9–3419 and 0FGL J1653.4–0200, with particular emphasis on the brightest of the 9 and 13 Chandra sources detected within the respective Fermi-LAT 95% confidence regions. Further follow-up studies, including optical photometric and spectroscopic observations, are necessary to identify these X-ray candidate counterparts in order to ultimately reveal the nature of these enigmatic γ-ray objects. [ABSTRACT FROM AUTHOR]