TITLE:   GCN CIRCULAR
NUMBER:  1565
SUBJECT: GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
DATE:    02/10/04 15:29:04 GMT
FROM:    Don Lamb at U.Chicago  <lamb@oddjob.uchicago.edu>

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.