TITLE:   GCN CIRCULAR
NUMBER:  35878
SUBJECT: GRB 240218A: ALMA detection
DATE:    24/03/05 21:41:49 GMT
FROM:    Tanmoy Laskar at U of Bath <tanmoylaskar@gmail.com>

T. Laskar, C. Peña (Utah), G. Schroeder (Northwestern), and K. D. Alexander
(Arizona) report on behalf of a larger collaboration:

"We observed GRB 240218A (Page et al., GCN 35742; Veres et al., GCN 35755;
Svinkin et al., GCN 35758) with the Atacama Large Millimeter/Submillimeter
Array (ALMA) at 97.5 GHz beginning on 2024 March 02 02:46:33 UT (13.0 d
after the burst). ALMA observations of this burst were delayed due to
ALMA's annual February shutdown.

Preliminary analysis reveals a mm source with flux density of ~ 0.1 mJy at
97.5 GHz and position:

RA (J2000) = 10:47:11.5
Dec (J2000) = 1:16:36.0

with uncertainty ~ 0.3" in each coordinate, consistent with the X-ray
position (Evans et al. GCN 35748) and radio position (Schroeder et al., GCN
35794).

We thank the JAO staff, AoD, P2G, and the entire ALMA team for their help
with these observations."