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TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2637
SUBJECT: IPN/HETE triangulation of GRB040802 (=H3485)
DATE:    04/08/04 21:45:12 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

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

I. Mitrofanov, S. Charyshnikov, V. Grinkov, 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,

E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team,

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

A. von Kienlin, G. Lichti, and A. Rau, on behalf of the
INTEGRAL SPI-ACS GRB team, report:

On 2004 August 02, HETE (FREGATE and WXM), Mars Odyssey (HEND),
Konus-Wind, and INTEGRAL (SPI-ACS) detected H3485, a 2.9 s long (T90)
gamma-ray burst.  Ulysses was off.  The Earth-crossing time was
64901.03 s.  The HETE localization was sent out in a series of 8 GCN
notices.  Triangulation using the IPN spacecraft resulted in an annulus
centered at RA, Decl (2000)= 327.8358, -14.1907 degrees, whose radius
is 47.7170 +/- 0.0315 degrees (3 sigma).  This annulus intersects the
WXM error box given in GCN Notice Sequence 8 to form an ~80 square
arcminute error box whose corners are at

RA(2000)    Decl(2000)
282.997     -42.516781
283.043     -42.433411
283.208     -42.884371
283.253     -42.801818

The fluences in the 7-30, 30-400, and 2-30 keV ranges were 0.49, 2.04,
and 0.56 x 10^-6 erg/cm^2.  The ratio of the X-ray to gamma-ray
fluences was ~0.24, making this a classical GRB.  The pseudo-redshift
was 1.7.

HETE detected this burst during a flare from GRS1915+105, making the
localization unusually difficult.  We apologize for any confusion.