GCN Circular 9273
Subject
GRB 090423: millimeter detection
Date
2009-04-28T00:29:21Z (16 years ago)
Edited On
2024-11-18T09:45:43Z (a month ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
A. J. Castro-Tirado (IAA-CSIC Granada), M. Bremer and J.-M. Winters
(IRAM Grenoble), J. Gorosabel, S. Guziy, M. Jelínek (IAA-CSIC), P.
Kubánek (GACE, Univ. de Valencia), A. de Ugarte Postigo (ESO Santiago)
and D. Pérez-Ramírez (Univ. de Jaén), 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."