Burst Fluence Distributions Of Soft Gamma Repeaters 1806-20 And 1900+14 In The Rxte Pca Era

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present a study of the fluence distributions of over 3000 bursts from SGR 1806-20 and over 2000 bursts from SGR 1900+14 using the complete set of observations available from the Rossi X-Ray Timing Explorer/Proportional Counter Array. Differential and cumulative event distributions are presented for both sources and are fitted with single and broken power laws. Event distributions are also examined in high and low burst rate regimes and power law indices are found to be consistent, independent of the burst rate. A novel distribution of the energy release versus burst fluence is presented. This distribution shows that the energy released in the SGR bursts is dominated by the most powerful events for both sources

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