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>> it's a brief blip of a few seconds of audio-frequency time series.

A bit more time and they should be able to point telescopes in the general direction of the event prior to a merger. Not sure what kind of directional precision can be obtained, nor if there would even be much to see.

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This was in fact accomplished and is attempted for many of the detections.

I'm pretty sure that they'd have to be pointed in the right direction first.

There is very little time between the start of something detectable, and its finish. But in the case of a neutron star merger, we were able to point other telescopes and see the resulting magnetar for several hours.

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