2005/08/29 by D. Gotz, D. Götz, S. Mereghetti +18 · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Cutoff #Flare #Gamma-ray bursts and supernovae #High energy #Magnetar #Neutron star #Pulsars and Gravitational Waves Research #Repeater (horology) #astro-ph
paper · pdf · doi:10.1051/0004-6361:20053648
10 pages, 8 figures, to appear in A&A main journal
arxiv created 2005/08/29 · openalex publication_date 2005/12/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 erg. We present a detailed analysis of it and discuss our results in the framework of the magnetar model.