TITLE:   GCN CIRCULAR
NUMBER:  34443
SUBJECT: GRB 230812B: iTelescope optical upper limit
DATE:    23/08/16 04:27:25 GMT
FROM:    Filipp Dmitrievich Romanov at Amateur astronomer <filipp.romanov.27.04.1997@gmail.com>

I observed the field of GRB 230812B (Fermi GBM team, GCN Circ. 34386)
remotely using telescope T24 (0.61-m f/6.5 reflector + CCD) of
iTelescope.Net in Sierra Remote Observatory (Auberry, California, USA)
on 2023-08-14. Six images (exposures 300 seconds, BINx1) were obtained
with Ic filter with mid time 05:10:04 UT (1.424 d. after the trigger).
I did not detect any optical afterglow in the Swift/XRT (Page, GCN
Circ. 34394) position. The magnitude limit is about 19 mag, compared
to the magnitudes of nearby stars from the USNO-B1.0 Catalog (Monet et
al., 2003).
F. D. Romanov (AAVSO member, observer code: RFDA).