TITLE: GCN CIRCULAR NUMBER: 39130 SUBJECT: GRB 240129A: further SAO RAS optical observations DATE: 25/02/03 14:10:39 GMT FROM: Moskvitin Alexander at SAO RAS mosk@sao.ru

A. Moskvitin, R. Uklein, Yu. Sotnikova (SAO RAS), A. Ghosh, S. Razzaque (CAPP, University of Johannesburg) report on behalf of the GRB follow-up team.

We observed the field of GRB 250129A (Beardmore et al., GCN 39066; Goad et al., GCN 39082; Frederiks et al., GCN 39116) with the SAO RAS 1-m telescope Zeiss-1000 equipped with the multi-mode focal reducer MAGIC on 2025 February 2, 01:23:43--01:43:23 UT (t_mid - T0 = 3.8669 days). We obtained 3 x 300 sec. images in R band.

The OT (Francile et al., GCN 39065; GCN 39075, Beardmore et al., GCN 39066, Schneider et al., GCN 39071, Belkin et al., GCN 39072; Izzo et al., GCN 39073; Izzo and Malesani, GCN 39074; Ghosh et al., GCN 39077; Schneider et al., GCN 39078; Brivio et al., GCN 39079; Siegel and Beardmore, GCN 39085; Zheng and Filippenko, GCN 39090; GCN 39102; Schlekat et al., GCN 39091; Antier et al., GCN 39096; Odeh et al., GCN 39097; Ferro et al., GCN 39098; Bochenek and Perley, GCN 39099; Malesani et al., GCN 39100; Romanov, GCN 39101; Watson et al., GCN 39104; Vinko et al., GCN 39105; Akl et al., GCN 39106; Moskvitin et al., GCN 39107; Calapai GCN 39109; Schlekat et al., GCN 39110; Gompertz et al., GCN 39114; Ror et al., GCN 39115; Lipunov et al., GCN 39119; Wu et al., GCN 39124; Paek et al., GCN 39129) is clearly detected in our stacked image with the brightness of R = 21.06 +/- 0.14 (calibrated against R2 magnitudes of nearby UNSO-B1 stars and not corrected for the MW extinction).

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