TITLE:   GCN CIRCULAR
NUMBER:  37899
SUBJECT: GRB 241026A: SAO RAS observations of possible optical afterglow
DATE:    24/10/27 00:19:04 GMT
FROM:    Moskvitin Alexander at SAO RAS <mosk@sao.ru>

A. S. Moskvitin, O. I. Spiridonova V. S. Shergin and V. V. Komarov
(SAO RAS) report on behalf of the GRB follow-up team.

We observed the field of the GRB 241026A (The Fermi GBM team,
GCN 37894; Melandri et al., GCN 37896) with 1-m telescope of SAO RAS
equipped with the CCD-photometer on October 26, 23:02:35--23:18:09 UT.
Observations started 20 minutes after the trigger.

Within the prompt enhanced Swift-XRT error circle (Evans, GCN 37897)
we detected a single uncatalogued source (possible GRB afterglow)
with the coordinates
R. A. (J2000) = 19:33:36.06,
Decl. (J2000) = +57:59:09.04 +/- 0".5
and brightness of R = 20.04 +/- 0.14 calibrated against nearby
USNO-B1 stars (R2 magnitudes) and not corrected for MW extinction.
Further observations are ongoing.