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GCN Circular 30492

Subject
GRB 210722A: D50 optical detection
Date
2021-07-24T08:40:09Z (3 years ago)
From
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>
M. Jelinek, J. Strobl, R. Hudec, C. Polasek (ASU CAS Ondrejov) report:

We observed the position of the bright GRB 210722A (D'Avanzo et al., GCN
30475; Page et a., GCN 30483; Barthelmy et al. GCN 30489; and Wood, GCN
30490) with the D50 telescope of the Astronomical Institute Ondrejov, near
Prague, Czech Republic. We performed a set of 35x 60s exposures in SDSS-i'
filter on July 24 from 1:20 to 2:01 UT.

The optical afterglow (Zhu et al., GCN 30476; Pankov et al., GCN 30478 &
30488; Kumar et al., GCN 30481; Butler et al., GCN 30484; and Thoene et
al., GCN 30487) is weakly detected in the overall combined image with the
exposure mean time 28.9h after trigger. The Atlas-calibrated magnitude of
the object is i' = 19.8 +/- 0.4.
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