GCN Circular 32669
Subject
GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
Event
Date
2022-10-10T20:34:25Z (3 years ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Edgar Vidal, WeiKang Zheng and Alexei V. Filippenko (UC Berkeley)
report on behalf of the KAIT GRB team:
We observed the field of GRB 221009A (=Swift J1913.1+1946; Dichiara et al.,
GCN 32632; Kennea & Williams, GCN 32635; Veres et al., GCN 32636; Bissaldi
et al.,
GCN 32637; Svinkin et al., GCN 32641; Ursi et al., GCN Circ. 32650;
Lesage et al., GCN 32642; Gotz et al., GCN 32660) with the 1-m Nickel
telescope
located at Lick observatory, California. Observations started about 15.73
hours
after the burst. Filtered B,V,R and I band images were taken with each
exposure
time of 300s. We detect the reported optical afterglow and measure its
brightness
with the following mag calibrated to the APASS catalog.
B = 20.18 +/- 0.2
V = 18.94 +/- 0.1
R = 17.59 +/- 0.1
I = 16.29 +/- 0.1
Additional images were also obtained with the 0.76-m Katzman Automatic
Imaging
Telescope (KAIT) also located at Lick Observatory. A set of clear (roughly
R)
band images were taken and the measured magnitude is consistent with the
above
Nickel R band magnitude.