  The Giant Radio Array for Neutrino Detection (GRAND) is an envisioned
observatory of ultra-high-energy neutrinos, cosmic rays, and gamma rays, with
energies above 100 PeV. GRAND targets the radio signals emitted by extensive
air showers induced by the interaction of ultra-high-energy particles in the
atmosphere, using an array of 200,000 radio antennas split into sub-arrays
deployed worldwide. GRANDProto13 (GP13) is a 13-antenna demonstrator array
deployed in February 2023 in the Gansu province of China, as a precursor for
GRANDProto300, which will validate the detection principle of the GRAND
experiment. Its goal is to measure the radio background present at the site,
validate the design of the detection units and develop an autonomous radio
trigger for air showers. We will describe GP13 and its operation, and show
preliminary results on noise monitoring.
