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This paper presents a tutorial explaining the use of Virtual Observatorytools in high energy astrophysics. Most of the tools used in this paper weredeveloped at the Strasbourg astronomical Data Center and we show how they canbe applied to conduct a multi-instrument, multi-wavelength analysis of sourcesdetected by the High Energy Stereoscopic System and the Fermi Large AreaTelescope. The analysis involves queries of different data catalogs, selectionand cross-correlation techniques on multi-waveband images, and the constructionof high energy color-color plots and multi-wavelength spectra. The tutorial ispublicly available on the website of the European Virtual Observatory project.

Using the Virtual Observatory: multi-instrument, multi-wavelength study of high-energy sources