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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2180 SUBJECT: IPN triangulation of GRB030428 (two large error boxes) DATE: 03/04/30 16:32:10 GMT FROM: Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu> 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 GRB teams, report: Ulysses and Konus-Wind observed this GRB at 81079 seconds. As observed by Ulysses, it had a duration of approximately 10 seconds, a 25-100 keV fluence of approximately 1.1E-05 erg/cm2, and a peak flux of approximately 1.5E-06 erg/cm2 s over 0.50 seconds. We have triangulated it to a preliminary annulus centered at RA, Decl(2000)= 152.915, 37.832 degrees, whose radius is 87.747 +/- 0.019 degrees (3 sigma). In addition, the Konus ecliptic latitude response limits the arrival directions to ecliptic latitudes between -23 and -33 degrees, that is, to those portions of the annulus between approximately RA, Decl = 193.2, -41.8 and 205.3, -35.3 degrees, and between 74.2, -10.6 and 66.9, -1.5 degrees. This localization can be improved, but as the event was not observed by Mars Odyssey, a small error box cannot be derived for it.
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