GCN Circular 39093
Subject
GRB 250128B: VLA radio upper limit
Date
2025-01-30T06:35:37Z (12 days ago)
From
Eleonora Troja <nora.gsfc@gmail.com>
Via
Web form
Roberto Ricci (U Rome), Muskan Yadav (U Rome), Rosa L. Becerra (U Rome), Yu-Han Yang (U Rome) and Eleonora Troja (U Rome) report:
We observed the field of the short GRB 250128B discovered by Fermi/GBM (Fermi GMB team, GCN 39057) and
Swift/BAT (Evans et al. GCN 39058) with the Very Large Array at the centre frequency of 6 GHz (C band)
with a bandwidth 4 GHz. The observations started on 2025-01-29 at 12:48 UT and lasted for 47 mins,
resulting in a mid elapsed time of 20.8 hours after trigger. The primary calibrator was 3C286 and
the phase calibrator J1546+0026.
Within the enhanced Swift/XRT position (Evans et al., GCN 39069) no counterpart is found down
to a 3-sigma upper limit of 15 microJy. Additional follow-up is planned.
We thank the VLA staff for promptly observing the target.