The engineering balloon experiment of GRAMS, a cosmic MeV gamma-ray observation project in which Bamba Lab. participates, was held in Taiki Town, Hokkaido, Japan. After 3 weeks of waiting for the wind, the balloon was released early morning on July 27, and after confirming stable operation at an altitude of 29 km, it was safely retrieved. We are looking forward to data analysis in the future. The photo shows the balloon floating in the dawn sky just before release.
