GCN Circular 28151
Subject
GRB 200716C: CrAO, Terskol, Assy-Turgen optical observations
Date
2020-07-21T15:34:11Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), S. Belkin (IKI), V. Rumyantsev (CrAO), A. Gorshkov
(INASAN), V. Kim (AFIF, Pulkovo Observatory), N. Pankov (HSE), K.
Kamyshnikov (HSE), M. Krugov (AFIF), A. Volnova (IKI), E. Mazaeva
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed GRB 200716C (Fermi GBM team, GCN 28123; Ukwatta et al GCN
28124; Torii et al., GCN 28139; Xue et al., GCN 28145; Frederiks et
al., GCN 28147) with ZTSH 2.6m telescope of CrAO observatory,
Zeiss-2000 of Terskol observatory, and AZT-20 telescope of Assy-Turgen
observatory. The optical afterglow (Ukwatta et al., GCN 28124; Lipunov
et al., GCN 28125; Hu et al., GCN 28126; Kumar et al., GCN 28138;
Gokuldass et al., GCN 28146; Jelinek et al., GCN 28149) and possible
host galaxy (D���Avanzo et al., GCN 28132) is detected in a stacked
image. Preliminary photometry of the (afterglow + possible host galaxy)
is following
Date UT start t-T0 Filter Exp. OT Err. UL Telescope
(mid, days) (s)
2020-07-17 19:17:52 0.84735 R 29*60 19.04 0.03 22.0 ZTSh
2020-07-17 19:50:49 0.87023 R 30*60 19.21 0.03 21.9 ZTSh
2020-07-18 18:33:32 1.83323 R 24*120 19.21 0.06 22.1 Zeiss-2000
2020-07-18 19:25:19 1.85253 R 17*60 19.21 0.06 22.1 ZTSh
2020-07-19 17:15:50 2.78066 r' 52*60 19.31 0.03 22.4 AZT-20
The photometry is based for R-calibration on the star
USNO-B1.0_id R
1196-0207871 16.18
and nearby SDSS stars for r' calibration
SDSS-DR12_id r
J130423.13+294053.3 15.970
J130352.15+293733.9 16.592
J130416.16+293906.8 16.914
The above photometry besides of the first observation is consistent
with a brightness of possible host in USNO-B1.0 (R2=19.23) and in SDSS
DR12 (r'= 19.301 +/- 0.026). We may conclude that we detected afterglow
only in the first observation on 0.84735 days after trigger at R=19.04
+/- 0.03.