GCN Circular 29549
Subject
GRB 210222B: Liverpool Telescope optical detection
Date
2021-02-23T00:32:17Z (3 years ago)
From
Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>
D. A. Perley (LJMU) reports:
A short ugriz imaging sequence of the optical afterglow of GRB 210222A
(Gropp et al. 29545) was obtained using IO:O on the robotic Liverpool
Telescope between 23:39 and 23:50 UT on 2021-02-22. Photometry relative
to PS1 standards in the field gives the following magnitudes:
t-t0 (d) magnitude
0.04333 : g = 18.67 +/- 0.04
0.04440 : r = 18.21 +/- 0.03
0.04544 : i = 18.01 +/- 0.03
0.04971 : z = 17.83 +/- 0.06
The g-band photometry lies below an extrapolation of the other bands and
the source is not detected in u-band, which may suggest a moderately
high redshift.
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