TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2231 SUBJECT: IPN triangulation of GRB030518B (annulus) DATE: 03/05/19 17:45:11 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses and Konus GRB teams, E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, and A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, report: Ulysses, Konus-Wind, and INTEGRAL (SPI-ACS) observed this GRB at 11537 seconds. As observed by Ulysses, it had a duration of approximately 10 seconds, with possible emission continuing to 250 seconds, a 25-100 keV fluence of approximately 3.7E-06 erg/cm2, and a peak flux of approximately 5.0E-07 erg/cm2 s over 0.25 seconds. We have triangulated it to a preliminary annulus centered at RA, Decl(2000)= 331.813, -35.244 degrees, whose radius is 60.010 +/- 0.075 degrees (3 sigma). This annulus can be constrained and/or improved, but as the event was not observed by Mars Odyssey, a small error box cannot be derived for it.