A highly magnetized long-period radio transient exhibiting unusual emission features

Long-period radio transients are a new class of astrophysical objects that exhibit periodic radio emission on timescales of tens of minutes. Their true nature remains unknown; possibilities include magnetic white dwarfs, binary systems, or long-period magnetars; the latter class are predicted to produce fast radio bursts (FRBs). Using the MeerKAT radio telescope, we conducted follow-up observations of the long-period radio transient GPM J1839–10. Here we report the source exhibits a wide range of unusual emission properties, including polarization characteristics indicative of magnetospheric origin, linear-to-circular polarization conversion, and drifting sub-structures closely resembling those observed in repeating FRBs. These radio characteristics provide clear evidence in support of the long-period magnetar model and establish the missing link between long-period radio transients, magnetars, and FRBs., , , # A highly magnetized long-period radio transient exhibiting unusual emission features

[https://doi.org/10.5061/dryad.ghx3ffbww](https://doi.org/10.5061/dryad.ghx3ffbww)

The dataset includes MeerKAT follow-up observation data used in the analysis of GPM1839-10 in the paper [https://www.science.org/doi/10.1126/sciadv.adp6351](https://www.science.org/doi/10.1126/sciadv.adp6351).

## Description of the data and file structure

The data are structured in the order corresponding to the plots in the manuscript.

The compressed data archive follows this structure:

dryad_data.tar.gz

\|- data/

\| |- plot1/

\| |- plot2/

\| |- plot3/

\| |- plot4/

, where each subdirectory contains Stokes data used to reproduce Figures 1, 2, 3, and 4 in the paper, respectively. The suffix \"vt\"* represents the array of time samples. \"vf\" represents the array of frequency channels. \"mxI\", \"*mxQ\", \"mxU\", \"mxV' correspond to the Stokes parameters I, Q, U, and V respectively.

## Sharing/Access information
...