GEOTAIL observation of SGR 1900 + 14 giant flare on 27 August 1998
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چکیده
The soft gamma repeater (SGR) 1900+14 emitted the giant flare on 27 August 1998. Most gammaray detectors saturated during the initial spike of the giant flare because of the intense flux. However the plasma particle detector onboard GEOTAIL observed the first 300 ms time profile with a time resolution of 5.577 ms and the initial spike of the giant flare was first resolved. The time profile shows some similarities to that of the SGR 1806-20 giant flare in 2004: the clear exponential decay and the small hump in the decay phase around 300 or 400 ms.
منابع مشابه
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A radio afterglow was detected following the 1998 August 27 giant flare from the soft gamma repeater (SGR) 1900+14. Its short-lived behavior is quite different from the radio nebula of SGR 1806-20, but very similar to radio afterglows from classic gamma-ray bursts (GRBs). Motivated by this, we attempt to explain it with the external shock model as invoked in the standard theory of GRB afterglow...
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