GCN Circular 9273
A. J. Castro-Tirado (IAA-CSIC Granada), M. Bremer and J.-M. Winters (IRAM Grenoble), J. Gorosabel, S. Guziy, M. Jel�nek (IAA-CSIC), P. Kub�nek (GACE, Univ. de Valencia), A. de Ugarte Postigo (ESO Santiago) and D. P�rez-Ram�rez (Univ. de Ja�n), report: "Following the detection by Swift of GRB 090423 (Krimn et al. GCNC 9198), millimeter observations were conducted on Apr 23 & 24 at the Plateau de Bure Interferometer. Consistent with the nIR afterglow (Tanvir et al. GCNC 9202) we clearly detect a source at 3-mm with a flux density of ~0.2 mJy (preliminary) on the combined dataset. Pending of confirming its variability we propose this as the likely millimeter afterglow to GRB 090423. Considering the reported redshift values around z ~ 8, this is the most distant radio source detected to date. Further observations are scheduled. We acknowledge the Bure staff for its excellent support."