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.