TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1783
SUBJECT: IPN triangulation of GRB030101 (two large error boxes)
DATE:    03/01/02 21:07:43 GMT
FROM:    Kevin Hurley at UCBerkeley/SSL  <khurley@sunspot.ssl.berkeley.edu>

K. Hurley, on behalf of the Ulysses and HETE GRB teams,

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

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, and

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

Ulysses, HETE-FREGATE, and Konus-Wind  observed this GRB at 74617
seconds.  (HETE trigger number 2523).  As observed by Ulysses, it had a
duration of approximately  1 second, a 25-100 keV fluence of
approximately  1.7E-06 erg/cm2, and a peak flux of approximately
8.7E-07 erg/cm2 s over 0.50 seconds.

We have triangulated it to a preliminary annulus centered at RA,
Decl(2000)=2.001, -37.527 degrees, whose radius is 58.137 +/-  0.024
degrees (3 sigma ).  

The Konus ecliptic latitude response constrains the arrival direction
to a band between ecliptic latitudes -14 and +6 degrees, that is, to
those portions of the annulus between RA, Decl= 287, -37 and 302, -14
degrees, and between RA, Decl= 47, +3 and 24, +17 degrees.

Further improvements to this localization are possible.