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GCN Circular 2558

Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
2004-03-31T15:13:38Z (20 years ago)
Diego Gotz at IASF-CNR <>
D. Gotz, S. Mereghetti (IASF, Milano), M. Beck (ISDC) on behalf of the
IBAS Localization Team, N. Mowlavi and S. Shaw on behalf of the INTEGRAL
Science Data Centre and the INTEGRAL Science Working Team report:

SGR 1806-20 has been moderately active after the burst of March 9 (Gotz et
al. GCN 2542). The times of the bursts discovered with IBAS in the
IBIS/ISGRI data are the following:

Start time (UT)			IBAS Alert Number
2004-03-09T10:24:08.35		1563     (GCN 2541, 2542)
2004-03-16T13:02:06.43		1677
2004-03-20T06:34:35.05		1685
2004-03-20T17:57:01.83		*
2004-03-29T06:15:40.97		*
2004-03-29T11:46:47.50		*
2004-03-30T17:03:05.81          1716,1717

(*) These bursts have been detected with significance below the threshold
for automatic delivery of IBAS Alert Packets

The burst of March 30 was among the brightest detected by INTEGRAL from
this Soft Gamma-Ray Repeater. It consisted of a main peak lasting about
0.11 s, followed by a smaller peak 0.1 s later. The fluence of the main
peak was about 3 x 10-7 erg cm-2 (15-100 keV).

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