GCN Circular 1507

K. Hurley and T. Cline, on behalf of the Ulysses GRB team, 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. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on behalf
of the HETE GRB team, report:

Ulysses and HETE observed this burst (HETE 2275, 53855 s).  As observed
by Ulysses, it had a duration of ~20 s, a 25-100 keV fluence of
~7.8E-06 erg/cm2, and a peak flux of ~7.0E-07 erg/cm2 s over 0.25
s.

We have triangulated it to a preliminary, 3 sigma annulus centered
at RA, Decl (2000)=345.048 o, -43.013 o, with radius 49.664 +/- 0.033
degrees.  This annulus intersects the HETE WXM position (Sequence
4) at just two points, reducing its area only slightly:

         RA                        DEC
     23 h 27 m 29.39 s       6 o 17' 47.58"
     23 h 27 m 19.78 s       6 o 18'  3.95"

A map will be posted shortly at ssl.berkeley.edu/ipn3/020819.

This annulus may be improved; it may become an error box when
the Mars Odyssey data become available.