TITLE: GCN CIRCULAR NUMBER: 39433 SUBJECT: GRB 250221A: VLA radio detection DATE: 25/02/23 18:32:23 GMT FROM: Roberto Ricci at INAF-IRA ricci@ira.inaf.it

R. Ricci (U Rome), E. Troja (U Rome) report on behalf of a larger collaboration:

We observed the GRB 250221A discovered by Swift/BAT (Caputo et al. GCN 39396) with the Very Large Array at the centre frequency of 10 GHz (X-band) with a bandwidth of 4 GHz at a mid time of 1.95 days after the trigger.

A weak source is detected at the target position with a flux density of 63 +/- 9 microJy.

Further observations are planned to assess its variability.

We thank the VLA staff for promptly executing the observations.

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