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I would also expect a huge, bursting flood of ionizing radiation. That's not the healthiest thing -- at least for folks like us...
Think about it, we worry about radiation from CMEs. which are mere "'burps' from our local star".
I'm fairly confident that huge mass concentrations (SMBHs) are common at the center of most (spiral, at least) galaxies. The annihilation/interaction of a pair of those 'wee beasties' would probably be news radiated across the entire universe...
Of course, since all our info travels at the C speed limit, such radiated "news" could arrive at our radio / IR / optical / UV / gravity wave sensors at any time -- from such events in our far distant past.
Be thankful for the inverse square law... '-)
TXnMA
