Study of the calibration method using the stars measured by the EUSO-TA telescope
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Date
2021-12-18
Type of Work
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Citation of Original Publication
"Plebaniak, Z. et al. Study of the calibration method using the stars measured by the EUSO-TA telescope. 37th International Cosmic Ray Conference (ICRC 2021). July 12th – 23rd, 2021, Online – Berlin, Germany"
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Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Subjects
Abstract
EUSO-TA is a ground-based experiment, placed at Black Rock Mesa of the Telescope Array
site as a part of the JEM-EUSO (Joint Experiment Missions for the Extreme Universe Space
Observatory) program. The UV fluorescence imaging telescope with a field of view of about
10.6◦ x 10.6◦
consisting of 2304 pixels (36 Multi-Anode Photomultipliers, 64 pixels each) works
with 2.5-microsecond time resolution. An experimental setup with two Fresnel lenses allows for
measurements of Ultra High Energy Cosmic Rays in parallel with the TA experiment as well as the
other sources like flashes of lightning, artificial signals from UV calibration lasers, meteors and
stars. Stars increase counts on pixels while crossing the field of view as the point-like sources. In
this work, we discuss the method for calibration of EUSO fluorescence detectors based on signals
from stars registered by the EUSO-TA experiment during several campaigns. As the star position
is known, the analysis of signals gives an opportunity to determine the pointing accuracy of the
detector. This can be applied to space-borne or balloon-borne EUSO missions. We describe
in details the method of the analysis which provides information about detector parameters like
the shape of the point spread function and is the way to perform absolute calibration of EUSO
cameras.