GRB 220107A: AbAO and Terskol optical observations
Abstract
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.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2022
- Bibcode:
- 2022GCN.31419....1P