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, B. Preger, 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;
On 26 March 2001 at 03:15:00 UTC, a hard spectrum, high energy
transient at high galactic latitude was detected and localized by
HETE. Both the FREGATE and the WXM instruments detected the event.
The burst triggered FREGATE in the 30-400 keV band.
The preliminary coordinates of the burst are R.A. = 11h50m59.11s,
Dec. = -23�32'44" (J2000), derived from combining data from the WXM
and Boresighted Optical Cameras. The statistical error radius in the
WXM localization is 10 arcmin (90% confidence). In addition, we
estimate a systematic error radius at present of 20 arcmin about this
location. The spacecraft aspect was known to an accuracy of +/- 2
arcmin (95% confidence) from the optical cameras, and will be
The burst exhibited a multiple-peaked structure and lasted about 25
seconds. The peak flux seen with FREGATE (6-30 keV) was ~1 Crab. The
peak flux was significantly less in the WXM.
Follow-up observations of this GRB event are encouraged.
Additional information on GRB010326 (including light curves and the
WXM error box), as well as the HETE mission, is available at:
HETE=High Energy Transient Explorer
FREGATE=French Gamma Ray Telescope
WXM=Wide Field X-ray Monitor
SXC=Soft X-ray Camera
This message may be cited.