TITLE:   GCN CIRCULAR
NUMBER:  40622
SUBJECT: GRB 250601A: VLT/FORS2 Optical Observation
DATE:    25/06/03 19:31:34 GMT
FROM:    Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>

Roberto Ricci (U Rome), Yu-Han Yang (U Rome), Rosa L. Becerra (U Rome) and Eleonora Troja (U Rome) report on behalf of the ERC BHianca team:

We observed the field of GRB 250601A (Fermi GBM team GCN 40596; DeLaunay et al., GCN 40600) with the FORS2 imager on the ESO VLT UT1 (Antu). Observations began 29.8 hours after the trigger and were carried out in the R filter with an average airmass of ~2.3. 

Our field covers the candidates reported by Swift/XRT (Page et al. GCN 40604, Salvaggio et al., GCN 40606) and EP/FXT  (Liu et al., GCN 40607). Compared with the Legacy Survey DR10 (Dey et al. 2019) catalogue, we do not detect any uncatalogued source down to R>24 AB (3-sigma).

Further observations are planned.

We thank the staff at the VLT for the rapid execution of these observations.