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Abstract
The strongest gamma-ray burst (GRB) of the century, GRB20221009A, has been detected by the Korean Pathfinder Lunar Orbiter Gamma-ray Spectrometer (KGRS) instrument onboard the Korean Pathfinder Lunar Orbiter (KPLO). KGRS uses a LaBr3 detector to measure GRB counts with five energy bins in the energy range from 30 keV to 12 MeV. KGRS detected GRB221009A at a distance of 1.508 million kilometers from the Earth. The full duration of the main burst was recorded between 13:20 and 13:26 on October 9, 2022 with peak counts of over 1000 times background. The dead time of KGRS reached as high as 50%, and the intrinsic gamma-ray spectrum of LaBr3 was significantly altered.
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1 Korea Institute of Geosciences and Mineral Resources, Geology and Space Division, Daejeon, South Korea (GRID:grid.410882.7) (ISNI:0000 0001 0436 1602); University of Science and Technology, Daejeon, Republic of Korea (GRID:grid.412786.e) (ISNI:0000 0004 1791 8264)
2 University of California, Los Angeles, Earth, Planetary and Space Sciences, Los Angles, USA (GRID:grid.468726.9) (ISNI:0000 0004 0486 2046)
3 Princeton University, Princeton, USA (GRID:grid.16750.35) (ISNI:0000 0001 2097 5006)
4 Korea Institute of Geosciences and Mineral Resources, Geology and Space Division, Daejeon, South Korea (GRID:grid.410882.7) (ISNI:0000 0001 0436 1602)
5 Nucare(Inc), Osong, Republic of Korea (GRID:grid.410882.7)
6 Korea Research Institute of Standards and Science, Daejeon, Republic of Korea (GRID:grid.410883.6) (ISNI:0000 0001 2301 0664)
7 Planetary Science Institute, Tucson, USA (GRID:grid.423138.f) (ISNI:0000 0004 0637 3991)
8 Moscow State University, Sternberg Astronomical Institute, Moscow, Russia (GRID:grid.14476.30) (ISNI:0000 0001 2342 9668)
9 TU Dortmund University, Image Analysis Group, Dortmund, Germany (GRID:grid.5675.1) (ISNI:0000 0001 0416 9637)