Abstract
We present a systematic analysis of all the BeppoSAX data of SGR1900+14. The observations spanning five years show that the source was brighter than usual on two occasions: ∼20 days after the August 1998 giant flare and during the 105 s long X-ray afterglow following the April 2001 intermediate flare. In the latter case, we explore the possibility of describing the observed short term spectral evolution only with a change of the temperature of the blackbody component. In the only BeppoSAX observation performed before the giant flare, the spectrum of the SGR1900+14 persistent emission was significantly harder and detected also above 10 keV with the PDS instrument. In the last BeppoSAX observation (April 2002) the flux was at least a factor 1.2 below the historical level, suggesting that the source was entering a quiescent period.
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Tiengo, A. et al. (2007). Long term spectral variability in the soft gamma-ray repeater SGR 1900+14. In: Zane, S., Turolla, R., Page, D. (eds) Isolated Neutron Stars: From the Surface to the Interior. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5998-8_4
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DOI: https://doi.org/10.1007/978-1-4020-5998-8_4
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