GCN Circular 23766

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
Not found
 
 
)
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
Not found
 
 
; de Ugarte Postigo et al., GCN
23692
Not found
 
 
; Lipunov et al. GCN 23693
Not found
 
 
; Selsing et al. GCN 23695
Not found
 
 
; Izzo et
al. GCN 23699
Not found
 
 
; Bolmer et al. GCN 23702
Not found
 
 
; Castro-Tirado et al. GCN
23708
Not found
 
 
; Kann et al. GCN 23710
Not found
 
 
; Im et al. GCN 23717
Not found
 
 
; Siegel et al. GCN
23725
Not found
 
 
; Mazaeva et al., GCNs 23727
Not found
 
 
, 23741
Not found
 
 
; D'Avanzo et al., GCN 23729
Not found
 
 
;
Kim et al., GCNs 23732
Not found
 
 
, 23734
Not found
 
 
; Kumar et al., GCN 23742
Not found
 
 
, Mazaeva et
al., GCN 23746
Not found
 
 
, Ragosta et al., GCN 23748
Not found
 
 
, Watson at al., GCN 23749
Not found
 
 
,
Watson et al., GCN 23751
Not found
 
 
).

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
Not found
 
 
) we can conclude that OT brighness should be around
21.8+-0.1.