GCN Circular 34498
Subject
GRB 230818A: Nickel and KAIT telescope optical observations
Event
Date
2023-08-19T22:13:43Z (2 years ago)
From
Weikang Zheng at UC Berkeley <weikang@berkeley.edu>
Via
legacy email
Neil Pichay, Elma Chuang, WeiKang Zheng and Alex Filippenko (UC Berkeley)
report on behalf of the KAIT GRB team:
We observed the field of GRB 230818A (Fermi GBM team, GCN 34478;
Tohuvavohu et al., GCN 34479) with the 1-m Nickel and 0.76-m KAIT
telescopes located at Lick observatory, California. Observations
started about 0.21 days after the burst. A total of 6 images (600s
exposure each) in R band were taken with Nickel telescopes, while
KAIT images were taken in clear band, with 60s exposure and coadded.
We detected the optical afterglow (Lipunov et al., GCNs 34476, 34477,
34481, 34482; Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483;
Malesani et al., GCN 34485; Siegel and Tohuvavohu, GCN 34486; Pankov
et al., GCN 34487; Quadri and Strabla, GCN 34488; Klose et al., GCN
34491; Moskvitin et al., GCN 34495; 34497) and measure the following
magnitude calibrated to the Pan-STARRS1 catalog:
t-t0(days) filter mag err
0.218 clear 21.8 0.3
0.226 R 21.6 0.2
0.324 clear 21.3 0.3