TITLE:   GCN CIRCULAR
NUMBER:  35843
SUBJECT: GRB 240218A: NOEMA upper limit
DATE:    24/03/01 16:27:52 GMT
FROM:    Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>

A. de Ugarte Postigo (CNRS/OCA & LAM), T. Laskar (Utah), 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),

K. D. Alexander (Arizona), E. Berger (Harvard), R. Chornock (Berkeley), W. Fong (Northwestern), R. Margutti (UC Berkeley), C. Peña (Utah), P. Schady (Bath), G. Schroeder (Northwestern),

report:

We observed the field of GRB 240218A (Page et al. 35742, Svinkin et al. GCN 35758) at a redshift of z = 6.782 (Saccardi et al. GCN 35756) with NOEMA at 74 and 90 GHz at a mean epoch 10.88 days after the burst.

Our observations show no detection of the afterglow (D’Avanzo et al. GCN 35747, Malesani et al. GCN 35749, Rossi et al. GCN 35762, Schroeder et al. GCN 35794) down to a 3-sigma limit of 65 microJy.

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).