This appears to be a text message from the JT65/JT9 reverse beacon network (RBN), but I'll break it down for you:

**Breakdown:**

* **23:55**: Time, in 24-hour format, indicating that this is a recent transmission.

* **JG7MRR**: The callsign of the transmitter, which identifies the amateur radio operator.

* **on JP-1048**: This refers to the location of the transmitting station. "JP" indicates Japan, and "1048" likely represents a specific grid square or geographical coordinate within Matsushima Prefectural Nature Park in Miyagi prefecture (MG).

* **(Matsushima Prefectural Nature Park, JP-MG)**: Additional information about the location of the transmitter.

* **10136.0**: The frequency being used by JG7MRR for transmission, in MHz.

* **FT8**: This is a digital mode being used by the operator (FT8 is a popular mode for weak signal work).

* **RBN -5 dB**: The reverse beacon network has detected this signal and reports that it's 5 dB above the noise floor. A negative value indicates that the signal is relatively strong.

* **via JI1HFJ-#[JI1HFJ-#]**: This suggests that the signal was relayed through a station with the callsign JI1HFJ, which might be another amateur radio operator acting as a repeater or gateway.

**Context:** The JT65/JT9 reverse beacon network (RBN) is an online system that allows amateur radio operators to share information about weak signals being detected on various frequencies. This message likely originated from the RBN's website or mobile app, where users can view and post detections of weak signals in real-time.