TITLE: GCN CIRCULAR NUMBER: 38780 SUBJECT: GRB 250101A: further SAO RAS optical observations DATE: 25/01/02 18:41:47 GMT FROM: Moskvitin Alexander at SAO RAS mosk@sao.ru
A. S. Moskvitin and O. I. Spiridonova, Yu. V. Sotnikova (SAO RAS), A. Ghosh, S. Razzaque (CAPP, University of Johannesburg) and A. S. Pozanenko (IKI RAS) report on behalf of the GRB follow-up team.
We observed the field of Swift GRB 250101A (Page et al., GCN 38752) with the 1-m telescope of SAO RAS, Zeiss-1000 + CCD-photometer on January 2, 15:20:13--18:06:55 UT (t_mid - T0 = 1.1394 days). We obtained 19 x 300 sec. images in Rc band.
The OT (Page et al., GCN 38752; Li et al., GCN 38753, GCN 38776; Mohan et al., GCN 38754; Zhu et al., GCN 38755, GCN 38759; Budnev et al., GCN 38756; Wu et al., GCN 38758; Moskvitin et al., GCN 38762, GCN 38765; Odeh and Guessoum, GCN 38763; Hu et al., GCN 38764; D'Avino and Izzo, GCN 38768; Escudero-Coca et al., GCN 38769; Leonini et al., GCN 38771; Zhang et al., GCN 38774; Siegel and Page, GCN 38775; Komesh et al., GCN 38777; Ghosh et al., GCN 38779) is clearly detected in our stacked image with the brightness of R = 21.86 +/- 0.06, calibrated against nearby PS1 stars (magnitudes were converted with the Lupton 2005 equations) and not corrected for the MW extinction.
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