This was one of those poorly kept secrets, rumours of the discovery started to circulate in late September.
Christopher Berry from LIGO couldn't give a response until the official announcement date.
Check out his link for an excellent personalized account of the discovery.
Quote:
sjastro wrote (Oct 7th)
What ever happened to the rumour of gravitational waves from two colliding neutron stars in NGC4993? I assume this is a separate event which is still undergoing analysis. Regards Steven
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Quote:
Christopher Berry LIGO replied (Oct 16th)
I don’t know where you hear these things…
GW170817
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https://cplberry.com/2017/10/16/gw170817/