TITLE: GCN CIRCULAR NUMBER: 39844 SUBJECT: GRB 250322A: VLT near-infrared observations DATE: 25/03/23 02:40:38 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma rosa.becerra@roma2.infn.it
Rosa Becerra (U Rome), Yu-Han Yang (U Rome), Eleonora Troja (U Rome) report on behalf of the ERC BHianca team:
We observed the field of GRB 250322A (Gupta et al., GCN 39835) with the HAWKI imager on the ESO VLT UT4 (Yepun). Observations began at T+7.4 hr with a total exposure of 360 sec in the J filter, and were carried out at an average airmass of about 1.2 and seeing of 0.56’’.
We do not detect any new source at the enhanced Swift-XRT position (Goad et al. GCN 39841) down to the following 5-sigma limit J>23.0 mag (Vega) calibrated using nearby stars in the 2MASS Catalogue.
We detect the host galaxy candidate reported by Martin-Carrillo et al. 2025 (GCN 39842) in our image. We estimate a preliminary magnitude of J=18.9±0.2 mag (Vega).
Further observations are planned to investigate potential variations in the brightness.
We thank the staff at the VLT, especially Thomas Rivinius, for the rapid execution of these observations.
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