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GCN Circular 30712

GRB 210822A: TSHAO optical observation
2021-08-25T09:49:39Z (3 years ago)
Alexei Pozanenko at IKI, Moscow <>
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 observed 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 with 20 and 30 sec 
exposition in R-filter.

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) at redshift z = 1.736 (Zhu  et al., GCN 30692) is detected in 
stacked images. Preliminary photometry of the afterglow in a stacked 
image of the second series is following.

Date       UT start t-T0    Filter  Exp.  OT    Err.  UL(3 sigma)
                     (mid, days)     (s)

2021-08-22 17:26:41 0.36184  R      196*20 18.63 0.03 21.0

The photometry is based on nearby USNO-B1.0 stars.

RA Dec R2
20:18:06.64416 +05:17:24.1404 12.33
20:17:59.55288 +05:18:19.5912 13.05
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