TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1663
SUBJECT: IPN triangulation of GRB021025 (portion of annulus)
DATE:    02/10/29 17:34:48 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

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

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

Konus and RHESSI also observed this event (GCN 1656).  The Konus
ecliptic latitude response limits the IPN annulus (RA, Decl=178.652,
+35.689 degrees, radius 73.524 +/- 0.111 degrees, 3 sigma) to the
portion in the south ecliptic hemisphere, that is, the portion between
RA, Decl = 92.5, +23.4 and 231.0, -18.5 degrees.  The 3-spacecraft
triangulation indicates that the most likely position along this
portion of the annulus is very roughly located at RA, Decl= 115.6, -7.8
degrees.

This error box may be improved slightly, but as the event was
not observed by MO, a small error box cannot be derived for it.