GCN Circular 23766
Subject
GRB 190114C: RTT150 optical observations
Event
Date
2019-01-21T20:05:18Z (8 years ago)
From
Rodion Burenin at IKI, Moscow <rodion@hea.iki.rssi.ru>
I. Bikmaev, E. Irtuganov, N. Sakhibullin (KFU/AST),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
I. Khamitov, S. Ozdemir (TUG), E. Gogus (Sabanci Uni.)
report:
We observed the field of GRB 190114C (Gropp et al., GCN 23688)
with the Russian-Turkish 1.5-m optical telescope (RTT150, Bakirlitepe,
TUBITAK National Observatory, Turkey) using the TFOSC instrument.
We obtained series of Rc exposures in January 17, 2019 (6 frames x 300
sec, UT = 17:42 - 18:28), ~ 69 hours after the burst. In the combined
image we detected the optical transient observed earlier by many
groups (Tyurina et al., GCN 23690; de Ugarte Postigo et al., GCN
23692; Lipunov et al. GCN 23693; Selsing et al. GCN 23695; Izzo et
al. GCN 23699; Bolmer et al. GCN 23702; Castro-Tirado et al. GCN
23708; Kann et al. GCN 23710; Im et al. GCN 23717; Siegel et al. GCN
23725; Mazaeva et al., GCNs 23727, 23741; D'Avanzo et al., GCN 23729;
Kim et al., GCNs 23732, 23734; Kumar et al., GCN 23742, Mazaeva et
al., GCN 23746, Ragosta et al., GCN 23748, Watson at al., GCN 23749,
Watson et al., GCN 23751).
Using the observations of Landolt standard stars we estimated the
brightness of the optical object in the combined image as
Rc=20.7+-0.1. Taking into account host galaxy brightness, r'=21.23,
measured from Pan-STARRS archival imaging by de Ugarte Postigo et al
(GCN 23692) we can conclude that OT brighness should be around
21.8+-0.1.