GRB 140423A: RTT150 optical observations. Bikmaev, I. ; Khamitov, I. ; Melnikov, S. ; Sakhibullin, N. ; Burenin, R. ; Pavlinsky, M. ; Sunyaev, R. ; Kirbiyik, H. ; Kiziloglu, U. ; Gogus, E. Abstract Publication: GRB Coordinates Network Pub Date: 2014 Bibcode: 2014GCN.16185....1B