L. Izzo, D. A. Kann (both HETH/IAA-CSIC), D. B. Malesani (DTU Space), D.
Hartmann (Clemson University), A. de Ugarte Postigo (HETH/IAA-CSIC,
DARK/NBI), and N. R. Tanvir (Univ. Leicester) report on behalf of the
We observed the field of GRB 190604B (Page et al., GCN 24742) with
X-shooter mounted on the ESO VLT UT2 (Kueyen). Images were obtained in
SDSS g'r'z', as well as a deeper 300 s r' exposure, centered at 05:24:16
UT on June 05, 2019 (0.8483 days after the GRB trigger).
At the position of the UVOT afterglow (Breeveld et al., GCN 24747) and
within the XRT error circle (Evans et al., GCN 24746), we detect a faint
source only in the latter image.
Using a recent computation of the X-shooter acquisition camera
zero-point value, the total number of counts, a seven arcsec radius
aperture and the exposure time of 300 s, we derive a magnitude of r'(AB)
= 23.27 +/- 0.09 mag.
Because of source faintness, no spectroscopy was attempted.