Two articles published in the journal “Monthly Notices of the Royal Astronomical Society” report different aspects of the study that led to the identification of the rare characteristics of a gamma-ray source that turned out to be a pulsar, cataloged as PSR J2039-5617. Two teams with various researchers in common used data collected by the Fermi Space Telescope and other instruments, and relied on the help of citizen scientists participating in the Einstein@Home project to study the pulsar. It’s a rare type of pulsar because it belongs to the millisecond class and also to the so-called redback class, which has a red dwarf as a companion.