NASA’s 18.8 million-cubic-foot super pressure balloon hit another milestone at 9:17 a.m. EDT Tuesday, May 31, crossing the 169.24 east longitude line, officially completing its first circumnavigation of the globe.
The balloon, flying the Compton Spectrometer and Imager (COSI) payload, achieved the milestone 14 days, 13 hours and 17 minutes after launching from Wanaka Airport, New Zealand. At the moment the balloon crossed the meridian, it was flying at an altitude of 110,170 feet heading northeast at 53.85 knots.
The COSI science team continues to collect and transmit data back to the payload’s control center at the University of California, Berkeley. On May 30, the COSI team had a significant breakthrough in detecting and localizing their first gamma ray burst, GRB 160530A (recorded in Gamma-ray Coordinates Network Circular 19473). Gamma ray bursts are comprised of the most energetic form of light and can last anywhere from milliseconds to several minutes. The phenomenon is associated with many types of deep space astrophysical sources, such as supernovas and the formation of black holes. The COSI gamma ray telescope observed the burst for nearly 10 seconds.
The complete article courtesy of NASA is here: