GCN Circular 1070
Subject
SGR1806-20: A Second, Intense Burst Localized by HETE
Date
2001-06-23T18:21:44Z (23 years ago)
From
George Ricker at MIT <grr@space.mit.edu>
SGR1806-20: A Second, Intense Burst Localized by HETE
G. Ricker, D. Lamb, and S. Woosley on behalf of the HETE Science Team;
R. Vanderspek, G. Crew, J. Doty, G. Monnelly, J. Villasenor; N.
Butler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G.
Pizzichini, and G. Prigozhin, on behalf of the HETE Operations and
HETE Optical-SXC Teams;
N. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, K.Torii, T.
Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, and C. Graziani, on
behalf of the HETE WXM Team;
J-L Atteia, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf
of the HETE FREGATE Team;
write:
At 15:54:53.123 UT on 23 June, the HETE FREGATE and WXM instruments
detected and localized an intense burst from SGR1806-20, a soft
gamma-ray repeater. This event, disseminated in near real time as a
GCN Alert (HETE BID_1566; see
http://gcn.gsfc.nasa.gov/gcn/hete_grbs.html), is the second burst
localized from this source in the past week. (The first burst was
reported in GCN Circular #1068). The coordinates (J2000) of the 23
June burst are:
R.A. = 272.1460 deg. (18h08m35s.02)
Dec. = -20.3658 deg. (-20:21:56)
The error circle for this localization is 6 arcmin in radius.
SGR1806-20 lies 3.1 arcmin from the HETE position.
The burst duration in the 8-40 keV band was ~200 ms, comprised of two
peaks each <100ms in duration. A total of 2250 counts were detected
during that interval, corresponding to a fluence of ~4 x 10-7 ergs
cm-2 . The peak flux was >6 x 10-6 ergs cm-2 s (ie >200 x Crab flux).
Follow-up observations of this transient are encouraged.
Additional information on this burst detection (including light
curves), as well as for the HETE mission, will be available at:
http://space.mit.edu/HETE/
Acronyms: HETE=High Energy Transient Explorer
FREGATE=French Gamma Ray Telescope
WXM=Wide Field X-ray Monitor
SXC=Soft X-ray Camera
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