TITLE: GCN CIRCULAR NUMBER: 39889 SUBJECT: GRB 250327B: SAO RAS optical candidate DATE: 25/03/27 22:33:49 GMT FROM: Alexander Moskvitin at SAO RAS mosk@sao.ru

A. S. Moskvitin, O. I. Spiridonova (SAO RAS), A. S. Pozanenko (IKI) report on behalf of a larger collaboration.

We observed the field of the field of the SVOM GRB 250327B (Bouchet et al., GCN 39888) with the SAO RAS 1-m telescope Zeiss-1000. The observations started on 21:28:15 UT (~17 minutes after SVOM trigger)

We found a bright uncatalogued source with R = 14.1 +/- 0.1 (calibrated against R2 magnitudes of nearby USNO-B1 stars) and the coordinates R.A. = 11:47:06.72 Dec. = +29:50:24.7 (+/- 0".5, Epoch = 2000.0)

The observations are ongoing.

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