TITLE: GCN CIRCULAR NUMBER: 38765 SUBJECT: GRB 250101A: SAO RAS observations of optical brightening DATE: 25/01/01 22:57:03 GMT FROM: Moskvitin Alexander at SAO RAS mosk@sao.ru

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

We continued follow-up observations of GRB 250101A OT (Page et al., GCN 38752; Li et al., GCN 38753; Mohan et al., GCN 38754; Zhu et al., GCN 38755, GCN 38759; Budnev et al., GCN 38756; Wu et al., GCN 38758; Odeh and Guessoum, GCN 38763; Hu et al., GCN 38764) with the 1-m telescope of SAO RAS, Zeiss-1000 + CCD-photometer.

After a steady decline in the afterglow light curve between 3.2 and 5.5 hours (see GCN 38762), we clearly observe an increase in the brightness of OT of R= 19.08 +/- 0.02 at 8.24 hours after the trigger.

We encourage further observations of GRB 250101A.

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