If it's supposed to be an object they've been looking for, for over 50 years, then it's not a black hole or a neutron star, because neither of those types of objects were seriously looked at, or for, until the mid to late 60's... and for a start, X-ray astronomy was in it's infancy in the 70's. Although, I maybe wrong...it might be the combined efforts of astronomers over 50 years and not just the specific way of observing.
Knowing NASA, it'll probably something completely underwhelming and mundane, to the point of it being a complete non event. Just a typical beat up to justify an announcement they'd be better of publishing in the next issue of Physics Letters, JoA or AAJ.
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