EUSO-SPB1: Flight Data Classification and Air Shower Search Results
July 22, 2019
The Extreme Universe Space Observatory on a Super Pressure Balloon (EUSO-SPB1) is the second balloon pathfinder of the JEM-EUSO collaboration. It is a nadir pointing UV telescope which aims at observing Ultra High Energy Cosmic Rays (UHECR) air showers through their fluorescence emission. It was launched the 24th of April, 2017, from the NASA balloon launch site in Wanaka, New Zealand. During it’s flight, EUSO-SPB1 took data during 12 moonless nights until the termination of the mission. In this paper we present events found in triggered data while searching for air showers. We classify these events into different populations whose characteristics and origins we discuss. We show that the majority of our triggered events are direct Cosmic Ray hits on the detector. No air shower candidate have been found in this analysis.
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