The launch wasn't secret at all, since it was being broadcasted live for anyone interested in watching it. At the moment, that consisted of a few rocket science fans who tuned in, but most of the watchers were the Edenian citizens themselves. They were absolutely thrilled to watch their first domestically made launch take place. A good example of how huge the interest to the launch was for the citizens of the country was that the launch was being broadcast through nearly all of the domestic news channels, which all had a higher viewership than their usual average for that specific time.
Although they hadn't been planning on keeping it a secret, they still hadn't planned to announce it, but that idea was squashed as the news of them applying for more than fifty orbital spots was leaked by someone from the International Telecommunications Union (ITU).