Two years of integral monitoring of the soft gamma-ray repeater SGR 1806-20: from quiescence to frenzy
Götz, D. and Mereghetti, S. and Molkov, S. and Hurley, K. and Mirabel, I. F. and Sunyaev, R. and Weidenspointner, G. and Brandt, S. and Del Santo, M. and Feroci, M. and Göğüş, Ersin and Von Kienlin, A. and Van der Klis, M. and Kouveliotou, C. and Lund, N. and Pizzichini, G. and Ubertini, P. and Winkler, C. and 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). pp. 313-321. ISSN 0004-6361
Official URL: http://dx.doi.org/10.1051/0004-6361:20053648
SGR 180620 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.
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