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why do peple think the most energetic events in the universe are GRBs?

Recently people have found supermassive black hole binaries with very short orbital period. link They should be more energetic than GRBs when they merge, right? It seems people do not talk about ...
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radial velocity fitting of a binary

I have two series of velocities (HJD, $v_{1}$ and $v_{2}$ ), how to fit in detail? There is any formula on the web? $sine$ curve is easy, but I need to consider an eccentric orbit. Suppose we can ...