The gamma-ray giant flare from SGR1806-20: Evidence for crustal cracking via initial timescales

Details The gamma-ray giant flare from SGR1806-20: Evidence for crustal cracking via initial timescales The gamma-ray giant flare from SGR1806-20: Evidence for crustal cracking via initial timescales

2005-04-03

arxiv.org/abs/astro-ph/0504056v3

Astrophys.J. 627 (2005) L129-L132

Astronomy and Astrophysics

Astrophysics

10 pages including 2 figures Ap J Letters in press, May 2005

Scientific paper

10.1086/432374

We report here on serendipitous observations of the intense gamma-ray flare from SGR 1806-20 that occured on 27 December 2004. Unique data from the Cluster and Double Star-2 satellites, designed to study the Earth's magnetosphere, provide the first observational evidence of three separate timescales within the early (first 100ms) phases of this class of events. These observations reveal that, in addition to the initial very steep (<0.25ms) X-ray onset, there is firstly a 4.9ms exponential rise timescale followed by a continued exponential rise in intensity on a timescale of 70ms. These three timescales are a prominent feature of current theoretical models including the timescale (several ms) for fracture propagation in the crust of the neutron star.

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