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GCN Circular 31419

Subject
GRB 220107A: AbAO and Terskol optical observations
Date
2022-01-09T12:27:19Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (IKI), S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze 
(AbAO), V. Agletdinov (KIAM), V. R. Ayvazian (AbAO),  D. Datashvili 
(AbAO), G. V. Kapanadze (AbAO) report on behalf of GRB IKI FuN:

We observed the field of GRB 220107A till now detected by GBM/Fermi (the 
Fermi/GBM team, GCN  1399; Kunzweiler et al. GCN  31400) and Swift
(DeLaunay et al. GCN  31402) with AS-32 telescope of Abastumani 
observatory (AbAO) and K-800 telescope of Mnt. Terskol observatory. The 
optical afterglow (Hosokawa et al. GCN 31413; Siegel et al. GCN 31415; 
Zhu et al. GCN 31416) is detected in stacked images. Preliminary 
photometry of the afterglow is following.

Date UT start t-T0 Filter Exp. OT UL(3sigma) Telescope
                         (mid, days) (s)

2022-01-08 23:38:28 1.38573 R     42*60   20.26 0.14 21.4 AS-32
2022-01-09 01:58:01 1.48613 Clear 108*30  20.24 0.14 22.0 K-800

Photometry is based on the SDSS-DR12 nearby stars
RA DEC R(Lupton transformations)
11:19:03.5786 +34:06:35.141 17.75
11:19:08.2856 +34:14:46.786 16.73
11:18:58.9570 +34:17:07.910 17.46

We note a presence of a galaxy 8.7 arcsec West presented as 
J111913.15+341014.4 in SDSS DR12 with r =19.623, i = 19.126 at 
photometric redshift of z_ph = 0.34 +/- 0.066. Despite the galaxy is 
unlikely to be the host galaxy of GRB 220107A, it might affect 
photometry of the afterglow in a crude plate scale images.
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