PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Gamma-ray burst detection with particle detectors onboard LEO satellites
C. Neubuser
Full text: pdf
Pre-published on: July 25, 2023
Published on:
Intense and long gamma-ray bursts (GRBs) can be seen from Earth when happening in close-by universes. As seen in the case of the recent, giant, long-lasting GRB221009A. GRB221009A originated from a collapsing star and was found at a redshift of 0.152. The event was observed by many gamma-ray detectors onboard different satellites as well as underground Very Low Frequency (VLF) antennas. An exceptionally large flux of high energy photons was measured with a peak emission of $>$1.8 millions/cm$^2$/s. The illumination of the Earth was centered on India and included Europe and Asia.
We report on the observation of sudden electron flux changes, measured by multiple charge particle instruments, including the HEPP-L detector on-board the China Seismo-Electromagnetic Satellite (CSES), and discuss the position and orientation dependence. The time structure of the electron flux changes of the GRB221009 closely matches the very distinctive time dependence of the photon flux associated with the main double peaked emission observed at around 13:20 UTC. The observed signal was found to originate mostly from Compton scattered electrons at the aluminium collimators, providing a real time monitoring of very intense photon fluxes.
DOI: https://doi.org/10.22323/1.444.0689
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