e-VLBI detection of Circinus X-1 at 1.6 and 8.4 GHz

Abstract

Following the return of Circinus X-1 to a recurrent radio flaring state (last seen in 1975 - 1985: ATel #563, #985) we have performed e-VLBI observations on the source at 1.6 and 8.4 GHz using an Australian array of radio telescopes (Parkes, ATCA, Mopra, and Hobart). e-VLBI allows rapid response to transient events and real-time analysis of VLBI data, in this case implemented by transfer of data between telescopes via optical fibres and software correlation on a PC cluster