NASA has discovered the first gamma-ray star system outside the Milky Way The brightest ever found.

An international team of scientists has found the brightest gamma-ray binary ever seen, and it’s the first to be seen outside the Milky Way galaxy.

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Neutrino said:

NASA has discovered the first gamma-ray star system outside the Milky Way The brightest ever found.

An international team of scientists has found the brightest gamma-ray binary ever seen, and it’s the first to be seen outside the Milky Way galaxy.

More…

https://futurism.com/energy-thats-out-of-this-world-nasa-just-found-a-gamma-ray-star-system/
That link is easier to read on this browser.

> An international team of scientists has found the brightest gamma-ray binary ever seen, and it’s the first to be seen outside the Milky Way galaxy. The team combined data from NASA’s Fermi Gamma-ray Space Telescope with those from other facilities and confirmed that what was once thought was just a high-mass X-ray binary (HMXB) was in fact, a gamma-ray binary system. Their findings have been published in The Astrophysical Journal.

How do you mistake a gamma ray binary for an X-ray binary? I think I know. Pointing accuracy in X-rays is far more accurate than in gamma rays, so the accurate position in X rays would be known. I think what has happened here is that someone has compared the known X-ray position with unknown sources from Fermi in gamma rays. Checking the timing of the gamma ray source would be the ultimate confirmation of the match.

Fermi has found a lot of gamma ray pulsars. This is the first I’ve heard of a gamma ray pulsar in a binary, although from the article five fainter and closer ones are known.