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💫The Slack Chat That Changed Astronomy

The Slack Chat That Changed Astronomy


The groundbreaking discovery of a neutron-star collision unfolded in a flurry of online messages.

A starry sky with one very bright spot

ESO / A.J. Levan / N.R. Tanvir

MARINA KOREN 2:06 PM ET SCIENCE

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In between its silly chatrooms and custom emojis, Slack is a place where real work gets done. But in some offices—no offense—the projects managed on the messaging platform are way cooler than others. Some even have cosmic significance.

On August 17, observatories in the United States and Italy detected gravitational waves, forces that bend the fabric of the universe, as they washed over Earth. Space telescopes observed a short gamma-ray burst, a powerful beam of radiation, coming from about the same part of the sky about two seconds later. Astronomers around the world quickly jumped into action, mobilizing dozens of ground-based and space telescopes to search for the source of these mysterious events.

There were calls and emails and, in the case of a few scientists who work for the University of California, Santa Cruz, and their associates, there were Slack messages. Ryan Foley, an astronomer at the university, was in Copenhagen when the alert went out. He started giving orders at 8:51 a.m. Pacific Time, then jumped on a bike and headed to his office at the city’s Dark Cosmology Center, where Dave Coulter and his fellow astronomers were already working.


Science

A few hours later, they would find the source of the mysterious observations: a massive collision of neutron stars in a galaxy 130 million light-years from Earth. The discovery, announced Monday, would produce the first-ever image of a cosmic merger powerful enough to generate gravitational waves, spawn scientific reports from some 3,500 scientists, and open a new chapter in astronomy.

But Foley, Coulter, and their colleagues didn’t know that yet.

The team drew up a list of galaxies in the region of sky where the near-simultaneous events were detected and started looking for the source. Screenshots of their messages, which they published along with their paper in Science, show a cascade of real-time coordination and information. Several people were typing. (The full exchange starts on page 26 here.) The astronomers searched images from the Carnegie Institution’s Swope telescope in Chile, looking for a “transient,” an object that hadn’t been observed in the data before.

The first few images didn’t turn up anything, said Charles Kilpatrick, a postdoctoral researcher at UC Santa Cruz, who was in California at the time.


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