TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2405
SUBJECT: IPN triangulation of GRB030926 (short/hard; large error box)
DATE:    03/09/26 22:52:46 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

K. Hurley and T. Cline, on behalf of the 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, 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:


Mars Odyssey - HEND, HETE - FREGATE, and Konus-Wind observed this short
(~180 ms) burst at 60748 s.  We have triangulated it to a preliminary,
3 sigma error box whose area is ~ 6700 sq.  arcmin. and whose
coordinates are:

        RA(2000)                 DEC(2000)
 11 h 29 m 28.34 s     42 o 54 '   4.77 "  (CENTER)
 11 h 48 m 39.60 s     39 o 41 '  53.44 "  (CORNER)
 11 h 48 m 26.73 s     39 o 28 '  28.57 "  (CORNER)
 11 h  7 m 54.94 s     45 o 22 '  35.24 "  (CORNER)
 11 h  7 m 52.77 s     45 o 10 '  47.92 "  (CORNER)
 
As this error box lies far from the Galactic plane, this
event is most likely a short-duration, hard-spectrum GRB,
rather than an SGR.

Because the Mars Odyssey response is rather weak (~3 sigma),
confirmation of this position from a fourth spacecraft will
be required.