TITLE:   GCN CIRCULAR
NUMBER:  35717
SUBJECT: GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
DATE:    24/02/13 18:24:21 GMT
FROM:    Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>

A. de Ugarte Postigo (CNRS/OCA & LAM), M. Bremer (IRAM), C. C. Thoene (ASU-CAS), J. F. Agui Fernandez (CAHA), S. Antier (OCA), S. Basa (LAM), M. Michalowski (AOI-AMU), D. A. Perley (LJMU), S. Martin (ESO, ALMA) report:

We observed AT2024cew / GOTO24pw (Belkin et al. GCN 35715, de Ugarte Postigo et al. GCN 35716), the optical counterpart candidate of GRB 240209A (Fermi GBM team, GCN 35712), with NOEMA at 74 and 90 GHz at a mean epoch 4.025 days after the burst.

There is no detection down to a 3-sigma limit of 60 microJy at 90 GHz. This limit disfavours the connection between AT2024cew / GOTO24pw and GRB 240209A, although it is not excluding.

Based on observations carried out under project number W23DI with the IRAM NOEMA Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).