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EUSO-TA is a ground-based florescence detector built to validate the designof an ultra-high energy cosmic ray fluorescence detector to be operated inspace. EUSO-TA detected the first air shower events with the technologydeveloped within the JEM-EUSO program. It operates at the Telescope Array (TA)site in Utah, USA. With the external trigger provided by the Black Rock Mesafluorescence detectors of Telescope Array (TA-FDs), EUSO-TA observed nineultra-high energy cosmic ray events and several laser events from the CentralLaser Facility of Telescope Array and portable lasers like the JEM-EUSO GlobalLight System prototype. The reconstruction parameters of the cosmic ray eventswhich crossed the EUSO-TA field of view (both detected and not detected byEUSO-TA), were provided by the Telescope Array Collaboration. As the TA-FDshave a wider field of view than EUSO-TA ($\sim$30 times larger), they allow thecosmic ray energy reconstruction based on the observation of most of theextensive air-shower profiles, including the shower maximum, while EUSO-TA onlyobserves a portion of the showers, usually far from the maximum. For thisreason, the energy of the cosmic rays corresponding to the EUSO-TA signalsappear lower than the actual ones. In this contribution, the analysis of thecosmic-ray events detected with EUSO-TA is discussed.

EUSO-TA ground based fluorescence detector: analysis of the detected events