Not trying to sound snarky or anything like that, just trying to be helpful, so if it comes off short or snarky that is accidental.
You have supplied frequency, time, and day in UTC, and that is a good start, but more information is even better. That data helps if the signal is something often on that frequency/day/time, but what if the signal is more transient?
Recordings. The description used tells us very little about the actual signal. Buzzes, knocks, and other odd digital sounds is a pretty wide field of possibilities. An audio, or video with audio, recording would go a long way towards identifying what you heard. There is a pretty good chance that any one of several people on the forum would be able to answer the query from hearing such a recording.
More information. What kind of radio and antenna were you using? This kind of information may seem excessive at first glance, but the kind of radio can indicate the possible receiver bandwith, thus increase or decrease the potential frequency range for consideration. The type of antenna can give an indication of how deep / far, or the coverage area of signals, to consider in suggestions. What mode were you using at the time you heard the signal? The same signal can have very different sounds in AM than it would in USB, as an example.
The more data / information the more likely to get a correct suggestion. Recordings, if you have a traditional radio, or recordings and screen shots if you have an SDR, are the biggest tools. The equipment used and conditions are very good to know. Complete descriptions of how you heard the signal, frequency, mode, signal strength, etc, helps narrow down the potential signal pool. And last, what the signal sounded like, but different people will often describe the same signal different ways.
T!