TITLE: GCN CIRCULAR NUMBER: 42250 SUBJECT: GRB 251014A: SAO RAS optical upper limit DATE: 25/10/14 10:06:03 GMT FROM: Alexander Moskvitin at SAO RAS mosk@sao.ru

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

We observed the field of the GRB 251014A (Ambrosi et al., GCN 42238; The Fermi GBM team, GCN 42237; de Barra et al., GCN 42249) with the 1-m SAO RAS telescope Zeiss-1000 equipped with the CCD-photometer. We obtained 7 x 300 sec. images in Rc band under mediocre weather conditions on 2025.10.14, 00:51:01--01:38:56 UT (t_mid - T0 = 0.77458 hours).

Within our FOV (covers ~80% of northern part of Swift-BAT error circle) we do not detect any new source down to the limiting magnitude of R_lim = 21.5. The field calibrated against nearby USNO-B1.0 stars (R2 magnitudes) and not corrected for the Galactic extinction.

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