GCN Circular 22979
Subject
GRB 180720B : TSHAO optical observations
Date
2018-07-20T21:36:57Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
I. Reva (FAPHI), A. Pozanenko (IKI), A. Volnova (IKI), E. Mazaeva (IKI),
A. Kusakin (FAPHI), M. Krugov (FAPHI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of GRB 180720B (Siegel et al., GCN 22973) with
Zeiss-1000 telescope of Tien Shan Astronomical Observatory starting on July
20 (UT) 19:46:17. We obtained several images in R and B-filters. The
optical afterglow (Martone et al. GCN 22976; Sasadaet al., GCN 22977) is
clearly detected in both filters. Preliminary photometry of the afterglow
at (UT, mid time) 19:59 is R =17.1 +/- 0.1. The photometry is based on
nearby USNO-B1.0 (R2) stars.