TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2583
SUBJECT: IPN triangulation of GRB040425 (=H3183)
DATE:    04/04/27 00:47:17 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,

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, A. Dullighan, 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, 

D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W.
Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, 

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

I. Mitrofanov, S. Charyshnikov, V. Grinkov, A. Kozyrev, M. Litvak, and
A. Sanin, on behalf of the HEND-Odyssey GRB team, report:

Mars Odyssey (GRS), Konus-Wind, INTEGRAL (SPI-ACS), and
RHESSI observed this HETE event, whose error box was given in a GCN
Notice on 25 April, 20:04:48, Sequence Number 3.  Triangulation
gives an annulus centered at RA, Decl (2000)= 261.762, -24.435,
whose radius is 28.899 +/- 0.020 degrees (3 sigma).  This annulus
interesects the HETE WXM error box at:

RA(2000)	Decl(2000)
233.588        -41.467
233.553        -41.330
232.605        -39.894
232.564        -39.722

The area of the combined HETE WXM/IPN error box is ~250 sq. arcmin.
Only minor improvements to this error box are expected. 

A map has been posted at ssl.berkeley.edu/ipn3/040425.