TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2393 SUBJECT: GRB030921 triangulation (annulus) DATE: 03/09/22 13:42:10 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, E. Mazets, V. Pal'shin, and D. Frederiks on behalf of Konus-Wind and Helicon/Coronas-F teams, T. Cline, on behalf of the Konus GRB team, GRB030921 was detected by Konus-Wind at 08:38:23.283 UT and Helicon-Coronas-F at 08:38:22.605 UT. It has a duration of ~16 sec. We have triangulated it to a preliminary annulus centered at RA(2000) = 261.175 deg, Decl(2000) = -18.929 deg, Radius = 78.4 +/- 1.1 degrees (3 sigma ).