GCN Circular 1565

Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii,
T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, and
T. Donaghy, on behalf of the HETE WXM Team;

G. Ricker, J-L Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf of
the HETE Science Team;

J. Villasenor, R. Vanderspek, J. Doty, G. Crew, G. Monnelly, N. Butler,
T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin,
G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of
the HETE Operations and HETE Optical-SXC Teams;

M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE
FREGATE Team;

write:


At 12:06:13.57 UTC (43573.57 s UT) on 4 Oct 2002, the HETE FREGATE,
WXM, and SXC instruments detected event H2380, a long GRB.  The WXM
flight localization was correct and was reported in a GCN Position
Notice at 12:07:02 UT, 49 sec after the beginning of the burst.

Ground analysis of the WXM data for the burst produced a refined
location, which was reported in a GCN Position Notice at 13:19:54 UT,
73 minutes after the burst.  The WXM localization SNR was 14.  The WXM
location can be expressed as a 90% confidence circle that is 10
arcminutes in radius and is centered at

RA = 00h 26m 47s, Dec = +18d 59' 13" (J2000).

Ground analysis of the SXC data for the burst produced a further
refinement in the location, which was reported in a GCN Position Notice
at 14:39:51 UT, 154 minutes after the burst.  The SXC localization SNR
was 9.  The SXC location can be expressed as a 90% confidence circle
that is 2 arcminutes in radius and is centered at

RA = 00h 26m 57s, Dec = +18d 55' 44" (J2000).

The SXC localization may be improved.

In the FREGATE 8-40 keV band, the burst had a duration of ~100 seconds.
In the WXM 2-25 keV band, the burst also had a duration of ~100
seconds.

A light curve for GRB021004 is provided at the following URL:

http://space.mit.edu/HETE/Bursts/

This message is citable.