Fermi/Gamma-ray Burst Monitor Analysis of SGR J1550-5418 Bursts During an Extreme Outburst in January 2009

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In 2008 October, the Soft Gamma Repeater (SGR) J1550-5418 entered a burst active period that lasted one week. On 2009 January 22, the source entered a second, extremely active period, which lasted for one month, and was followed by a third, small episode in 2009 March. The highest number of bursts from the SGR ( 450) was observed on January 22 with the Fermi/Gamma-ray Burst Monitor (GBM). The combination of the unique GBM temporal and spectral capabilities has enabled us to study spectra of most of these SGR bursts in great detail. We present here the results of our time integrated spectral and temporal analysis of all the bursts observed with GBM during the source's active period in January 2009. Further, we compare the properties of these bursts with bursts observed from other SGR sources during extreme activations.

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