TITLE:   GCN CIRCULAR
NUMBER:  32245
SUBJECT: GRB 220623A: iTelescope optical upper limit
DATE:    22/06/23 10:17:01 GMT
FROM:    Filipp Dmitrievich Romanov at Amateur astronomer  <filipp.romanov.27.04.1997@gmail.com>

I observed the field of GRB 220623A (Sbarufatti et al., GCN Circ.
32243) remotely using telescope T24 (0.61-m f/6.5 reflector + CCD) of
iTelescope.Net in Sierra Remote Observatory (Auberry, California, USA)
on 2022-06-23. Three images (exposures 300 seconds, BINx1) were
obtained with Ic filter with mid time 09:26:42 UTC (8548 seconds after
the trigger). I did not detect any optical afterglow in the BAT and
the XRT (Kennea et al., GCN Circ. 32244) positions. The magnitude
limit is about 18 mag, compared to the magnitudes of nearby stars from
the USNO-B1.0 Catalog (Monet et al., 2003).
F. D. Romanov.