GCN Circular 2504

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.