Mr Wang and an international team, including scientists from Australia's national science agency CSIRO, Germany, the United States, Canada, South Africa, Spain and France discovered the object using the CSIRO's ASKAP radio telescope in Western Australia.
Business as well nowadays as software engineering teams can be easily distributed and travel and employment within EU is a non-issue. I have team members (at least) from Finland, Sweden, Estonia, Belgium, Romania, China, Germany, UK, New Zealand, Spain, Ethiopia - within company the interaction expands to teams and nationalities from US, France, India, Poland, Croatia...
Its always been that way, you read about how scientists in Germany and the Uk and France secretly wrote to each other during WW1 sharing their latest thoughts and discoveries.
For most things related to looking into space nowadays, we need a distributed team so we can cover the sky around the clock. It would be bad if we miss a 1 minute event "because it's daylight on our side".
it might be bad for optical telescopes, but not radio telescopes fortunately
I think it's more about sky coverage - which parts of the sky can be viewed from which telescopes at any given moment. that would require international collaboration
I just love how international Science is.