Simulation and experimental work is ongoing on technological development and background rejection strategies. Phase one is called GRANDProto35, that includes 35 antennas and 24 scintillators, deployed in the Tian Shan mountains in China. If a pulse is observed simultaneously in the signals from three or more scintillators, the signals are recorded. As of October 2018, GRANDProto35 is in commissioning phase. So far, the system achieves 100% detection efficiency for trigger rates up to 20 kHz.