I think the 0 longitude most likely is accidental.
Yet, here is another thing to think about:
Zero longitude is the longitude of Greenwich, i.e. London, a significant city through the ages. Cities and towns, especially ones with old age, aren't positioned randomly but in geographical suitable locations: valleys, rivers, coast, etc. Since the position of London is not random, the 0 longitude isn't totally random as well.
Still seeing no connection to this 26s pulse tho.
Just saying that software bugs tend to show up here. If the pulse was localized by cross-correlating data from lots of different stations worldwide, it could potentially be some kind of numerical artifact.
Yet, here is another thing to think about: Zero longitude is the longitude of Greenwich, i.e. London, a significant city through the ages. Cities and towns, especially ones with old age, aren't positioned randomly but in geographical suitable locations: valleys, rivers, coast, etc. Since the position of London is not random, the 0 longitude isn't totally random as well. Still seeing no connection to this 26s pulse tho.