FREGATE observation of a strong burst from SGR1900+14

Details FREGATE observation of a strong burst from SGR1900+14 FREGATE observation of a strong burst from SGR1900+14

2002-03-06

arxiv.org/abs/astro-ph/0203080v1

AIP Conf.Proc. 662 (2003) 82-87

Astronomy and Astrophysics

Astrophysics

5 pages, Latex, Woods Hole 2001 GRB conference

Scientific paper

10.1063/1.1579307

After a long period of quiescence, the soft gamma repeater SGR1900+14 was suddenly reactivated on April 2001. On July 2, 2001, a bright flare emitted by this source triggerred the WXM and FREGATE instruments onboard the HETE-2 satellite. Unlike typical short (0.1 s) and spiky SGRs recurrent bursts, this event features a 4.1 s long main peak, with a sharp rise (50 ms) and a slower cutoff (250 ms). This main peak is followed by a 2 sec decreasing tail. We found no evidence of any precursor or any extended `afterglow' tail to this burst. We present the preliminary spectral fits of the total emission of this flare as observed by the FREGATE instrument between 7 and 150 keV. The best fit is obtained with a model consisting of two blackbody components of temperatures 4.15 keV and 10.4 keV. A thermal bremsstrahlung can not be fitted to this spectrum. We compare these features and the burst energetics with the other strong or giant flares from SGR1900+14.

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