Scientific Reports (Aug 2024)

The GRB221009A gamma-ray burst as revealed by the gamma-ray spectrometer onboard the KPLO (Danuri)

  • K. J. Kim,
  • S. Y. Kim,
  • D. Paige,
  • J. Grodner,
  • Y. Choi,
  • J. H. Park,
  • Y. K. Kim,
  • K. S. Park,
  • K. B. Lee,
  • N. Yamashita,
  • A. A. Berezhnoy,
  • C. Wöhler

DOI
https://doi.org/10.1038/s41598-024-69928-w
Journal volume & issue
Vol. 14, no. 1
pp. 1 – 5

Abstract

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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.