About 10 years ago I was interested in trying to image a Gamma Ray Burst optical counterpart and subscribed to alerts from the Gamma-ray Coordinates Network (GCN) Circulars. Having caught one I then lost interest. http://www.threehillsobservatory.co.uk/astro/astro_image_81.htm
I’ve just had a look in the GCN circular archives around the time of this GW event and there was a lot of chatter there about it eg https://gcn.gsfc.nasa.gov/gcn3/21505.gcn3 so that could be a good place to monitor for future events.
Robin