Giant flare of SGR 1806-20 from a relativistic jet

Details Giant flare of SGR 1806-20 from a relativistic jet Giant flare of SGR 1806-20 from a relativistic jet

2005-02-16

arxiv.org/abs/astro-ph/0502320v3

Publ.Astron.Soc.Jap. 57 (2005) L11-L15

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted by Publications of the Astronomical Society of Japan (PASJ)

Scientific paper

Japanese magnetospheric explorer GEOTAIL recorded a detailed light curve during the initial 600 msec of a giant flare from SGR 1806-20 on December 27, 2004. We show that the observed light curve is well explained by an emission from relativistically expanding fireballs, like those of gamma-ray bursts (GRBs). Especially, the observed rapid fading after 500msec suggests that ejecta is collimated in a jet. We derive an upper limit on the jet opening half-angle of 0.2 radian that is as narrow as those of GRBs.

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