It's a shame that no one else has bagged this one. It makes analysis much easier when the event is known to have occured, and is vey useful for callibrating systems.
DaveGee had a miss, so from my basic calculations that means that the duration from your site could be upto about 50 seconds.
I would be more convinced by the curve if the tail end wasn't so wayward, but that may be a processing artefact - looking promising though.
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