Soft Gamma-Ray Repeaters as Observed by the HETE-2 WXM

Astronomy and Astrophysics – Astronomy

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X- And Gamma-Ray Telescopes And Instrumentation, Gamma-Ray Sources, Gamma-Ray Bursts, Spaceborne And Space Research Instruments, Apparatus, And Components

Scientific paper

The Wide Field X-ray Monitor (WXM) onboard HETE-2 spacecraft observes the rectangular sky region of about 1.6 str centered at the anti-solar direction. SGR1806-20 and SGR1900+14 were monitored with the WXM instrument for about 60 days between June and August 2001 while they were within the field of view. We have firmly detected 2 and 4 bursts from SGR1806-20 and SGR1900+14, respectively. A burst from SGR1900+14 occurred at 2001 July 2, 03:34 UT had a high fluence of ~ 8 × 10-6 ergs cm-2 (6 - 40 keV) and broad-band burst spectrum was obtained by WXM and FREGATE (GCN Circular 1078). Here we present preliminary analyses of these bursts, and other ~20 possible bursts from the SGRs detected by HETE-2.

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