TITLE:   GCN CIRCULAR
NUMBER:  2333
SUBJECT: IPN triangulation of GRB030726 (large error box)
DATE:    03/07/28 20:26:34 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

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

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

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,

A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL
SPI-ACS 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, RHESSI, Konus-Wind, INTEGRAL (SPI-ACS), and
HETE (FREGATE) observed this GRB at 23905 seconds.  As observed by
Ulysses, it had a duration of approximately 30 seconds, a 25-100 keV
fluence of approximately  1.7E-05 erg/cm2, and a peak flux of
approximately  1.1E-06 erg/cm2 s over 0.50 seconds.

We have triangulated it to a preliminary, 3 sigma error box whose
approximate area is 630 sq. arcmin. and whose coordinates are:

    RA(2000)                              DEC(2000)
 ERROR BOX CENTER:   16 h 54 m 49.80 s   -21 o  6 '  43.99 "
 ERROR BOX CORNER 1:  16 h 54 m 40.02 s  -21 o  9 '  31.55 " 
 ERROR BOX CORNER 2:  16 h 59 m  3.59 s  -18 o 43 '   7.78 " 
 ERROR BOX CORNER 3:  16 h 50 m 23.70 s  -23 o 36 '  56.65 " 
 ERROR BOX CORNER 4:  16 h 54 m 59.57 s  -21 o  3 '  56.62 " 

This error box may be improved, but as Ulysses, the Earth, and
Mars are practically aligned, a small error box cannot be derived
for this event.