Two years of INTEGRAL monitoring of the soft gamma-ray repeater SGR 1806-20: From quiescence to frenzy

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Abstract

SGR 1806-20 has been observed for more than 2 years with the INTEGRAL satellite. In this period the source went from a quiescent state into a very active one culminating in a giant flare on December 27, 2004. Here we report on the properties of all the short bursts detected with INTEGRAL before the giant flare. We derive their number-intensity distribution and confirm the hardness-intensity correlation for the bursts found by Götz et al. (2004a, A&A, 417, L45). Our sample includes a very bright outburst that occurred on October 5, 2004, during which over one hundred bursts were emitted in 10 minutes, involving an energy release of 3 × 1042 erg. We present a detailed analysis of it and discuss our results in the framework of the magnetar model. © ESO 2005.

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Götz, D., Mereghetti, S., Molkov, S., Hurley, K., Mirabel, I. F., Sunyaev, R., … Woods, P. M. (2006). Two years of INTEGRAL monitoring of the soft gamma-ray repeater SGR 1806-20: From quiescence to frenzy. Astronomy and Astrophysics, 445(1), 313–321. https://doi.org/10.1051/0004-6361:20053648

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