GCN Circular 1637

K. Hurley, on behalf of the Ulysses and HETE GRB teams,

E. Mazets and S. Golenetskii, on behalf of the Konus-Wind
and Helicon-Coronas GRB teams,

T. Cline, on behalf of the Ulysses, HETE, and Konus GRB teams, 
and

G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R.
Vanderspek, J. Villasenor, G. Crew, G. Monnelly, N. Butler, J.G.
Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R.
Manchanda, G.  Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T.
Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi,
T. C. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on
behalf of the HETE GRB team, report

Ulysses, Konus, Helicon, and HETE-FREGATE observed this burst
at 23510 seconds (HETE trigger 2389).  As observed by Ulysses,
it had a duration ~10 s, a 25-100 keV fluence of ~4x10^-6 erg/cm2,
and a peak flux over 0.5 s of ~3.4E-7 erg/cm2 s.  We have
triangulated it to a preliminary, 3 sigma annulus centered
at RA, Decl=176.706, +36.394, whose radius is 79.291 +/- 0.062
degrees.

Earth-blocking, ecliptic latitude, and field-of-view considerations
limit the arrival direction to that section of the annulus between
RA, Decl=81, +25 degrees and RA, Decl=64, +44 degrees.  

This error box can be refined, but since the burst was not
observed by Mars Odyssey, a small error box cannot be derived
for it.