TITLE:   GCN CIRCULAR
NUMBER:  44853
SUBJECT: GRB 260604C: 6 GHz VLA observations
DATE:    26/06/07 10:22:39 GMT
FROM:    Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>

R. Ricci, M. Yadav,  E. Troja (U Rome) report:

We observed the field of GRB 260604C which triggered Fermi-GBM (Fermi-GBM team, GCN 44822) and SVOM (Gotz et al., GCN 44823) with Very Large Array in C-band at the centre frequency of 6 GHz with a bandwidth of 4 GHz on June 04th 2026 (38 hours after the trigger). 

Data were calibrated and imaged using standard procedures in CASA (v6.6.1). 1331+305 (3C286) was used for flux density and bandpass calibration and J1513+2338 was used for complex gain calibration.

No radio source was detected at the optical transient position (Lipunov et al., GCN 44827) down to a preliminary 3-sigma upper limit of ~24 uJy/beam.  

Further observations are planned.

We thank the VLA staff for executing the observations.