SGR1806-20: Localization 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, G. Pizzichini,
and G. Prigozhin, on behalf of the HETE Operations and HETE
N. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, A. Yoshida, E.
Fenimore, M. Galassi, and C. Graziani, on behalf of the HETE WXM
J-L Atteia, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf
of the HETE FREGATE Team;
At 19:42:49 UT on 18 June, the HETE FREGATE and WXM instruments
detected and localized burst emission from the vicinity of
SGR1806-20, a soft gamma-ray repeater. This event may indicate the
onset of a new period of activity by this source. The coordinates
(J2000) of the burst source were:
R.A. = 272.0265 deg.
Dec. = -20.2743 deg
The error circle for the localization is 36 arcmin in radius.
SGR1806-20 lies 11.8 arcmin from the HETE position. [Another galactic
X-ray source, GX9+1, lies 100 arcmin from the HETE position.]
The burst duration in the 8-40 keV band was <300 ms. A total of 864
counts were detected during that interval, corresponding to a flux
of >10 times Crab.
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:
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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