TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  2504
SUBJECT: IPN triangulation of an intermediate burst from SGR1806-20
DATE:    04/01/01 21:01:07 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,

S. Golenetskii, E. Mazets, V. Pal'shin, and D. Frederiks on behalf of
the Konus-Wind and Helicon/Coronas-F 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, and

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

Konus-Wind, Helicon, Mars Odyssey - HEND, and RHESSI observed this
burst at 60913 s on 28 December 2003.  As observed by Konus, its
duration was 1.1s, its 15-200 keV fluence was 3x10^(-5) erg/cm2, and
its peak flux was 8.6x10^(-5) erg/cm2 s.  It had a soft spectrum, with
kT=20 keV.

Using Konus and Odyssey data, we have triangulated it to a preliminary
annulus centered at RA, Decl(2000)=186.046, -2.629 degrees, whose
radius is 85.436 +/- 0.028 degrees (3 sigma).  As the centerline of
this annulus passes 0.011 degrees from the position of SGR1806-20, we
believe that this event is an intermediate burst from that source.