GCN Circular 30714
Subject
GRB 210822A: TSHAO continued optical observation
Event
Date
2021-08-25T16:34:52Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Kusakin (FAP), I. Reva (FAP), Pozanenko (IKI), N.
Pankov (HSE), V. Kim (FAP) report on behalf of GRB-IKI-FuN:
We continue observations of GRB 210822A (Page et al., GCN 30677; Wang
et al., GCN 30678; Prasad et al., GCN 30693; Frederiks et al., GCN
30694) with Zeiss-1000 telescope of Tien Shan Astronomical Observatory.
on Aug. 22 (UT) 15:48:55 -- 18:48:47. We obtained series in R-filter
starting on 2021-08-24 (UT) 16:47:35.
The optical afterglow (Page et al., GCN 30677; Zheng et al., GCN 30679;
Butler et al., GCN 30680; Fu et al., GCN 30684; Zhu et al., GCN 30692;
Romanov et al., GCN 30701; Guelbenzu et al., GCN 30703; Siegel et al.,
GCN 30710; Belkin et al., GCN 30712) at the redshift of z = 1.736 (Zhu
et al., GCN 30692) is detected in stacked image. Preliminary
photometry of the afterglow in a stacked image is following.
Date UT start t-T0 Filter Exp. OT Err. UL(3 sigma)
(mid, days) (s)
2021-08-24 16:47:35 2.33041 R 3180 21.60 0.26 22.0
The photometry is based on nearby USNO-B1.0 stars.
USNO-B1.0
RA Dec R2
20:18:06.64416 +05:17:24.1404 12.33
20:17:59.55288 +05:18:19.5912 13.05