Being picked up by more news sources, from NASA press releases I presume, e.g.:
In continuing coverage, Fox News (5/19) reports that on Tuesday, NASA launched a so-called “super-pressure balloon” from an airport in New Zealand, and it was traveling at “a good clip at an altitude of over 108,000 feet in the neighborhood of Australia.” According to the article, the 18 million cubic feet balloon “carries a gamma ray telescope and a device with microphones that NASA said is ‘designed to record acoustic wave field activity in the stratosphere.’” The article explains that the larger purpose of the mission is “to test this kind of balloon technology as the craft spends a long period of time in the air – maybe over 100 days, NASA said.”
FWIW, the April "Tech Briefs" magazine published by NASA had an article on he Raven Aerostar Super Pressure Balloon.
There is an online version, but my prior attempt to include the link got killed. I'm not clear on the best way to do this, but if you add this to a web address that is just techbeiefs followed by the most common thing that requires 4 spaces, you might get there: