GCN Circular 31357
Subject
GRB 220101A: Liverpool telescope imaging of a high-redshift afterglow
Date
2022-01-01T22:14:13Z (2 years ago)
From
Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>
D. A. Perley (LJMU) reports:
We acquired multicolor imaging of the optical afterglow of GRB 220101A
(Tohuvavohu et al., GCN 31347) using the IO:O camera of the 2m robotic
Liverpool Telescope. The afterglow was observed twice in the griz
filters on 2022-01-01 UT, with the first epoch taking place between
20:07 and 20:17 and the second between 21:21 and 21:31.
Photometry with reference to SDSS secondary standard stars in
the field gives the following magnitudes:
dt(d) filter mag unc
0.6236 g 21.97 0.10
0.6254 r 19.84 0.03
0.6271 i 18.48 0.03
0.6288 z 18.20 0.03
0.6749 g 22.21 0.13
0.6767 r 19.92 0.03
0.6784 i 18.58 0.03
0.6802 z 18.27 0.03
Magnitudes are given in the SDSS system and uncorrected for extinction.
Times are referenced to the BAT trigger time.
The colors are consistent with a moderately high-redshift (z = 4-5)
afterglow, in agreement with the result of Fu et al. (GCN 31353).
DisclaimerNone