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GCN Circular 2415

Subject
SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
Date
2003-10-09T08:29:46Z (21 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@mi.iasf.cnr.it>
S. Mereghetti, D.Gotz (IASF, Milano)  and M. Beck (ISDC) for the ISDC IBAS
Localization Team, F. Mirabel (CEA, Saclay)  and the INTEGRAL Science
Working Team report:

During INTEGRAL Core Program observations of the Galactic Center region,
IBAS has detected several bursts from SGR 1806-20. They are summarized in
the following Table.

The positions derived by IBAS with typical errors smaller than 3 arcmin
confirm that all of them originated from SGR 1806-20 and not from the
nearby sources SGR 1808-20 (GCN 2351)  or XTE J1810-197 (IAUC 8168, IAUC
8190).

The bursts were detected with the IBIS/ISGRI instrument in the 15-100 keV
energy range.


Date October 2003      	25-100 keV Fluence      Duration
Day      UT              (erg cm-2)               (s)

6    18:51:27.4           3 x 10-8                0.06      GCN 2408
8    03:27:03.9           4 x 10-7                0.2       (*)
8    03:27:56.1           3 x 10-7		  0.2       (*)
8    20:22:06.5           4 x 10-8                0.1

(*) IPN observations of this burst have been reported (GCN 2414)


In the near future IBAS will start to distribute automatic Alert Packets
for SGR bursts detected with high significance.  This will allow rapid
follow-up observations at other wavelengths.  The source coordinates in
the Alert Packets will allow IBAS users to distinguish such events from
classical GRBs.

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