2026/02/10 by Yang-Zhao Ren, F. R. Zhu, Feng-Rong Zhu +57 · 1 voice · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #COSMIC cancer database #Cosmic ray #Detector #Earth's magnetic field #Earthquake Detection and Analysis #Energy (signal processing) #Gamma-ray bursts and supernovae #Monte Carlo method #Solar energetic particles #Spacecraft #astro-ph.HE
paper · pdf · doi:10.1051/0004-6361/202558377
published in Astronomy and Astrophysics 707, A318 (EDP Sciences)
arxiv published 2026/02/10 · arxiv updated 2026/02/10 · openalex created_date 2026/02/13 · openalex publication_date 2026/02/20 · openalex updated_date 2026/07/27
GECAM is a constellation of all-sky monitors in hard X-ray and gamma-ray band primarily aimed at high energy transients such as gamma-ray bursts, soft gamma-ray repeaters, solar flares and terrestrial gamma-ray flashes. As GECAM has the highest temporal resolution (0.1~μs) among instruments of its kind, it can identify the so-called simultaneous events (STE) that deposit signals in multiple detectors nearly at the same time (with a 0.3~μs window). However, the properties and origin of STE have not yet been explored. In this work, we implemented, for the first time, a comprehensive analysis of the STE detected by GECAM, including their morphology, energy deposition, and the dependence on the geomagnetic coordinates. We find that these STE probably result from direct interactions between high-energy charged cosmic rays and satellite. These results demonstrate that GECAM can detect, identify, and characterize high-energy cosmic rays, making it a Micro Cosmic-Ray Observatory (MICRO) in low Earth orbit.