GRB 210722A: continued Assy optical observations
Abstract
We continue observations of of the field of GRB 210722A (D'Avanzo et al., GCN 30475; Page et al., GCN 30483; Barthelmy et al. GCN 30489; Wood et al., GCN30490) with AZT-20 telescope of Assy-Turgen observatory. We obtained several frames in r' - filter starting on 21-07-24 (UT) 21:34:39. We clearly detect the bright optical afterglow (D'Avanzo et al., GCN 30475; Zhu et al., GCN 30476; Pankov et al., GCN 30478, 30488, 30494; Kumar et al., GCN 30481; Butler et al., GCN 30484; Thoene et al., GCN 30487; Jelinek et al., GCN 30492; Fu et al., GCN 30504). Preliminary photometry of the afterglow in the stacked image is following Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) (mid, days) (s) (AB) 2021-07-24 20:56:07 n/d 42*60 r' 21.3 0.2 21.7 The photometry is based on the nearby PS1 stars. The photometry is still compatible with the single power law of the afterglow light curve.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- July 2021
- Bibcode:
- 2021GCN.30505....1K