GRB 020918

K. Hurley, on behalf of the Ulysses GRB team,

T. Cline, on behalf of the Ulysses and Konus-Wind GRB teams, and

E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report:

Ulysses and Konus-Wind  observed this GRB at 47292 seconds.  As
observed by Ulysses, it had a duration of approximately 3 seconds, a
25-100 keV fluence of approximately  6.1E-06 erg/cm2, and a peak flux of
approximately  1.4E-06 erg/cm2 s over 0.25 seconds.

We have triangulated it to a preliminary annulus centered at
RA, Decl (2000)=171.715, 38.791 degrees, whose radius is
88.681 +/-0.030 degrees (3 sigma).

This event was not observed by Mars Odyssey, so we will not
be able to obtain a small error box for it.  We are waiting
for more Konus data, however, which may allow us to determine
the ecliptic latitude and exclude part of the annulus.

K. Hurley, on behalf of the Ulysses GRB team,

E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, and

T. Cline, on behalf of the Ulysses and Konus-Wind GRB teams, report:

A preliminary analysis of the Konus data for this event (GCN 1546
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 )
indicates that it originated from an ecliptic latitude between +20 and
+40 degrees.  Combining this information with the triangulated position
(an annulus centered at RA, Decl (2000)=171.715, 38.791 degrees, whose
3 sigma radius is 88.681 +/-0.030 degrees) limits the possible arrival
directions to the two sections of the annulus contained between RA,
Decl (2000)= 14.4, 50.3 and 45.4, 38.0 degrees, and between RA, Decl
(2000)= 257.7, -2.9 and 273.8, 16.6 degrees.