TITLE: GCN CIRCULAR NUMBER: 33394 SUBJECT: GRB 230228A: 6 GHz VLA radio upper limit DATE: 23/03/02 17:55:24 GMT FROM: Genevieve Schroeder at Northwestern University genevieveschroeder2023@u.northwestern.edu
G. Schroeder (Northwestern), T. Laskar (Utah), E. Berger (Harvard) report:
"We observed the position of the possibly short GRB 230228A (Dichiara et al. GCN 33378; Fletcher GCN 33389) with the Karl G. Jansky Very Large Array (VLA) under program 23A-296 (PI: Schroeder) beginning on 2023 March 2.02 UT (1.78 days post-burst) at a mean frequency of 6 GHz.
Based on preliminary analysis, we do not detect any radio emission at or near the position of the XRT afterglow (Beardmore et al., GCN 33382) to a 3-sigma limit of 12 microJy. Additional followup is planned.
We thank the VLA staff for quickly approving and executing these observations."