Speaker
Description
GRANDProto300 (GP300) is the ongoing pathfinder array for the next-generation GRAND (Giant Radio Array for Neutrino Detection) ultra-high-energy astroparticle observatory. Since April of 2025, GP300 has operated as a 20 km² array of 65 detection units in northwest China. This location was strategically selected for its radio-quiet environment, which is essential for the array’s radio self-triggering capabilities and high-sensitivity detection of cosmic rays (and, eventually, neutrinos). Our current focus is optimizing the hardware and software of the data acquisition system. This is a critical step to ensure stable, continuous observation, as GP300 relies entirely on radio signals for self-triggering. In this talk, we will present the current status of GP300, including its ongoing expansion, and the latest implementation of the radio self-trigger system, including the detection of the first cosmic rays using this system.