This appears to be a message in a format used by amateur radio operators, specifically in the context of digital modes of communication such as FT8. Let's break down what we have here:

- **05:15**: The time of day.

- **JQ3FIN/P on JP-1551(Harima Central Prefectural Park, JP-HG)**: This seems to be a call sign followed by a location.

- **JQ3FIN** is the amateur radio operator's (the "station") call sign. In amateur radio, each country has its own series of prefixes and suffixes that identify who operates the radio station. "JQ" would likely indicate Japan.

- **/P**: This indicates that the station is operating under a special permit or license.

- **7041 FT8 [JQ3FIN]**: The first number, "7041", could be related to the frequency on which the operator is transmitting in MHz (megahertz).

- **FT8**: This specifies the mode of transmission, known as a digital mode used for amateur radio communication. FT8 is a mode that is designed for efficient and effective low-power communication over long distances.

- **[JQ3FIN]**: These brackets often contain the call sign of the station transmitting in this mode or some other identifying information related to the transmission.

Given this context, the message appears to be from an amateur radio operator (identified by their call sign JQ3FIN) operating under a special permit, broadcasting on a specific frequency (7041 MHz), using the FT8 digital mode. They are operating at Harima Central Prefectural Park in Japan at 05:15.