Some information about the dataset
Recording of the signal started around September 2009. The signal was already observed in 2008, however, and perhaps earlier.
The signal occurs at different intensities labeled weak, moderate, strong, very strong, and intense. This calendar only shows the highest intensity of each occurrence.
Around 2013, a change was observed. Events before and after 2013 may be associated with different sources.
Some observations may be spurious (noise, false positives), and some observations may be missing (suppression, false negatives).
Start times are more important than stop times. The signal was sometimes fading away, making it difficult to determine a precise stop time.