Fermi/GBM View of the 2019 and 2020 Burst Active Episodes of SGR J1935+2154
| Autor: | Lin, Lin, Gogus, Ersin, Roberts, Oliver J., Baring, Matthew G., Kouveliotou, Chryssa, Kaneko, Yuki, van der Horst, Alexander J., Younes, George |
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| Rok vydání: | 2020 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/abbefe |
| Popis: | We present temporal and time-integrated spectral analyses of 148 bursts from the latest activation of SGR J1935+2154, observed with Fermi/GBM from October 4th 2019 through May 20th 2020, excluding a ~130 s segment with a very high burst density on April 27th 2020. The 148 bursts presented here, are slightly longer and softer than bursts from earlier activations of SGR J1935+2154, as well as from other magnetars. The long-term spectral evolution trend is interpreted as being associated with an increase in the average plasma loading of the magnetosphere during bursts. We also find a trend of increased burst activity from SGR J1935+2154 since its discovery in 2014. Finally, we find no association of typical radio bursts with X-ray bursts from the source; this contrasts the association of FRB 200428 with an SGR J1935+2154 X-ray burst, to date unique among the magnetar population. Comment: Accepted to be published in ApJ Letters |
| Databáze: | arXiv |
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