TITLE:   GCN CIRCULAR
NUMBER:  34125
SUBJECT: AT2023lcr (ATLAS23msn/ZTF23aaoohpy): ALMA 100 GHz Detection
DATE:    23/06/30 21:24:44 GMT
FROM:    Anna Y Q Ho at Cornell University <ayh24@cornell.edu>

Anna Y. Q. Ho (Cornell) and Daniel A. Perley (LJMU) report on behalf of a larger collaboration:

In an observation beginning at 03:35 on 29 June UT, we observed the location of the extragalactic fast optical transient AT2023lcr (Swain et al. GCN Circ. 34022; Fulton et al. GCN Circ. 34042) using the Atacama Large Millimeter/sub-millimeter Array (ALMA) in Band 3 (100 GHz) under excellent weather conditions. A counterpart was detected with a preliminary peak flux density of 0.17 mJy, at high significance (10-sigma). 

Data were obtained under Program ID 2022.A.00025.T. We thank the ALMA staff for rapidly approving and executing our observations.