  The General Anti-Particle Spectrometer (GAPS) project is being carried out to
search for primary cosmic-ray antiparticles especially for antideuterons
produced by cold dark matter. GAPS plans to realize the science observation by
Antarctic long duration balloon flights in the late 2010s. In preparation for
the Antarctic science flights, an engineering balloon flight using a prototype
of the GAPS instrument, "pGAPS", was successfully carried out in June 2012 in
Japan to verify the basic performance of each GAPS subsystem. The outline of
the pGAPS flight campaign is briefly reported.
