for the JEM-EUSO Collaboration EUSO-Balloon is a balloon-borne experiment, conceived as a pathfinder for JEM-EUSO experiment which is the first experiment measuring the highest energy cosmic rays from space. EUSO-Balloon is equipped with an optical system made by two Fresnel lenses and one photo detection module (PDM), representing a complete prototype for the JEM-EUSO experiment. On 24th August 2014 EUSO-Balloon was launched from Timmins Balloon base in Ontario (Canada) in collaboration with

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... e French Space Agency CNES. The flight lasted about 5 hours with a float altitude of about 38 km, observing regions with different background light. The instrument has been also tested with laser shots emitted from an helicopter flown under the balloon for about 2 hours. A procedure to analyze these data and compare them with simulation is developed into the Offline framework. The results are reported in the following contribution. Figure 1: On the left: EUSO-Balloon schematic view. The two lenses their supports are indicated in grey, while the red box on the top represents the PDM. On the right: The gondola which contained EUSO-Balloon during its first launch.