GCN Circular 31426

A. Moskvitin (SAO) and A. Medvedev (SAO),
on behalf of larger GRB follow-up team report:

We observed the field of GRB 220107A (The Fermi GBM team, GCN 31399
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;
Kunzweiler et al. GCN 31400
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; DeLaunay et al. GCN 31402
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; Suresh et al.,
GCN 31408
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) with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer.
6 x 300 sec. images were obtained in Rc band on January 9,
22:27:09 -- 23:10:20 UT (T_mid - T0 = 2.3356 days).

The OT (Hosokawa et al. GCN 31413
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; Siegel GCN 31415
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; Zhu et al.
GCN 31416
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; Pankov et al., GCN 31419
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; Moskvitin et al., GCN 31422
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;
Castro-Tirado et al., GCN 31423
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) is clearly visible in the stacked
frame. Preliminary photometry of the afterglow is R = 21.01 +/- 0.04
(based on nearby SDSS-DR12 stars mentioned in GCN 31422
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).