Interestingly the detection by several pro supernova survey teams of the optical transient was submitted to the Transient Name Server, (which generates alerts for possible supernovae and which I monitor it for potential candidates for spectroscopic classification.)
https://wis-tns.weizmann.ac.il/object/2017gfo
It was mag 17.3 at discovery which would have been just bright enough for a spectrum with my setup. The TNS submissions and subsequent spectrum which showed it to be something unusual, was embargoed for 2 months though so it only appeared on TNS today giving no chance to observe it. Had an amateur picked it up in the meantime though (eg as part of a supernova patrol) and posted it on TNS, they would have been credited with the discovery as IAU recognise the first to publish as the discoverer.
Robin