TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2375
SUBJECT: IPN triangulation of GRB030831 (annulus)
DATE:    03/09/02 19:32:11 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 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,

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, and

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

Ulysses, Konus-Wind, RHESSI, Mars Odyssey-HEND and GRS, and INTEGRAL
(SPI-ACS) observed this GRB at 54424 seconds.  As observed by Ulysses,
it had a duration of approximately  20 seconds, a 25-100 keV fluence of
approximately  5.1E-06 erg/cm2, and a peak flux of approximately
1.2E-06 erg/cm2 s over 0.25 seconds.

We have triangulated it to a preliminary annulus centered at RA,
Decl(2000)=342.570, -21.977, whose radius is 60.225 +/- 0.014 degrees
(3 sigma).

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