You can download this tutorial as a Jupyter notebook and run it interactively. Once the phases are assigned, you can use gtselect to filter out the unwanted phase periods, effectively removing the pulsar from the data completely. You will also need to use the pulsar light curve to define an off-pulse interval in phase-space. You can accomplish this by assigning pulse phases to the pulsar by using a known ephemeris. Pulsar gating is the process of removing the flux of a bright pulsar from a region of interest, thus enabling the analysis of fainter sources in the region. Or you could be looking at starburst galaxies at higher galactic latitudes, and a pesky millisecond pulsar keeps getting in your way. You may be looking at a supernova remnant, or seeking new pulsar wind nebulae, and need to remove the accompanying pulsar.
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