POEMMA Balloon with Radio

In order to effectively study charged particles above 10¹⁸ eV enormous exposures are needed. An alternative to deploying large arrays dispersed over thousands of square kilometers is to place a detector in low-Earth orbit and observe the atmosphere from above. The Probe of Extreme Multi-Messenger Astrophysics (POEMMA) is a conceptual design for such a mission. Dual satellites flying in loose formation with hybrid focal surfaces would be sensitive to both the fluorescence and Cherenkov emissions from extensive air showers. POEMMA Balloon with Radio (PBR) aims to develop these observational techniques. Flying on a super pressure balloon for a long duration flight, PBR has three main science goals: 1) measure ultra-high energy cosmic rays showers with energies above a few EeV; 2) observe high-altitude horizontal air showers with energies above the cosmic ray knee by a novel hybrid of optical and radio measurements; and 3) follow up astrophysical event alerts to search for very high energy neutrinos. PBR is currently under development for a launch in 2027. This contribution will provide an overview of the mission and a summary of its current status.