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We present temporal and time-integrated spectral analyses of 148 bursts fromthe latest activation of SGR J1935+2154, observed with Fermi/GBM from October4th 2019 through May 20th 2020, excluding a ~130 s segment with a very highburst density on April 27th 2020. The 148 bursts presented here, are slightlylonger and softer than bursts from earlier activations of SGR J1935+2154, aswell as from other magnetars. The long-term spectral evolution trend isinterpreted as being associated with an increase in the average plasma loadingof the magnetosphere during bursts. We also find a trend of increased burstactivity from SGR J1935+2154 since its discovery in 2014. Finally, we find noassociation of typical radio bursts with X-ray bursts from the source; thiscontrasts the association of FRB 200428 with an SGR J1935+2154 X-ray burst, todate unique among the magnetar population.

Fermi/GBM View of the 2019 and 2020 Burst Active Episodes of SGR J1935+2154