GCN Circular 1534

K. Hurley and T. Cline, on behalf of the Ulysses, HETE, and Mars Odyssey GRB teams,

I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak and A. Sanin,
on behalf of the HEND/Odyssey GRB team,

W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr,
on behalf of the GRS/Odyssey 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, Mars Odyssey-HEND, Mars Odyssey-GRS, and HETE-FREGATE
observed this GRB at 24827 seconds.  As observed by Ulysses, it had a
duration of approximately  15 seconds, a 25-100 keV fluence of
approximately 5.1E-06 erg/cm2, and a peak flux of approximately
5.1E-07 erg/cm2 s over 0.50 seconds.

The burst arrival direction was very close to that of the Ulysses/MO
vector, resulting in one very wide annulus (~112') and two much smaller
ones (~6' and 8').  The result is two alternate, preliminary, 3 sigma
error boxes each with approximate areas 500 square arcminutes each
whose coordinates are:

    RA(2000)                              DEC(2000)
 ERROR BOX CENTER:   0 h 44 m 28.95 s    -68 o 57 '  38.48 " 
 ERROR BOX CORNER 1:  0 h 35 m 20.77 s    -69 o 33 '  50.43 " 
 ERROR BOX CORNER 2:  0 h 53 m 07.86 s    -68 o 17 '  23.34 " 
 ERROR BOX CORNER 3:  0 h 35 m 06.37 s    -69 o 32 '  58.52 " 
 ERROR BOX CORNER 4:  0 h 53 m 37.28 s    -68 o 18 '  22.10 " 
 ERROR BOX CORNER 5:  0 h 43 m 27.01 s    -69 o 06 '  33.49 "
 ERROR BOX CORNER 6:  0 h 45 m 32.84 s    -68 o 48 '  28.17 "

                                       OR

 ERROR BOX CENTER:   1 h 41 m 58.08 s    -62 o  7 '  29.68 " 
 ERROR BOX CORNER 7:  1 h 46 m 11.24 s    -61 o 14 '  55.49 " 
 ERROR BOX CORNER 8:  1 h 37 m 09.77 s    -62 o 59 '  57.38 " 
 ERROR BOX CORNER 9:  1 h 46 m 02.94 s    -61 o 13 '  46.22 " 
 ERROR BOX CORNER 10:  1 h 37 m 21.91 s   -63 o 02 '  29.96 " 
 ERROR BOX CORNER 11:  1 h 43 m 07.30 s   -62 o 00 '  49.41 "
 ERROR BOX CORNER 12:  1 h 40 m 46.66 s   -62 o 14 '  24.57 "


There is a chance that the ambiguity can be resolved by further
processing, if Konus or RHESSI observed this event; Konus data are
scheduled to be downlinked around 0500 UT on Thursday September 5.

Maps will be posted shortly at ssl.berkeley.edu/ipn3/020904.
However, viewer discretion is advised; they aren't pretty.

These error boxes may be improved.

A GCN socket message has been issued with two larger, four-cornered
error boxes, due to the format of those message.