TITLE:   GCN CIRCULAR
NUMBER:  34343
SUBJECT: GRB 230805B: SAO RAS optical observations
DATE:    23/08/05 20:40:08 GMT
FROM:    Moskvitin Alexander at SAO RAS <mosk@sao.ru>

A. S. Moskvitin (SAO RAS) and V. P. Goranskij (SAI MSU) report
on behalf of a larger collaboration.

We observed the field of the GRB 230805B (Cenko et al., GCNC #34339)
with the 1-m telescope of SAO RAS Zeiss-1000 equipped with the
Multi-Mode Photometer-Polarimeter (MMPP). We obtained 4 x 300 sec.
exposures in Rc band on August 5, 17:50:15--18:11:48 UT.

Within the XRT error circle we marginally detected a single object
(possible OT) with coordinates (Epoch = 2000.0):
R.A. = 13:50:58.2, Dec. = +31:11:28.6 (+/- 0".5)
and brightness about R = 22.7 +/- 0.3 (t_mid - t0 = 6.61 hours).

This preliminary photometry is based on the nearby SDSS stars;
magnitudes are converted using Lupton (2005) equations.