Optical/IR flux fading rapidly in GX 339-4: OIR jet quenching

Astronomy and Astrophysics – Astronomy

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Infra-Red, Optical, Black Holes, Transients

Scientific paper

The transient black hole candidate GX 339-4 is currently softening in X-ray, making a transition out of the hard state (ATel #2545). We are monitoring the source with the Faulkes Telescope South (located at Siding Spring, Australia) and the SMARTS 1.3m telescope and ANDICAM instrument (at Cerro Tololo, Chile). From the Faulkes monitoring, the source brightened in the hard state over the last five months from a faint (V = 19.6, R = 18.8, i' = 18.6; errors are 0.1 mag at most) magnitude on 2009-10-22 = MJD 55126 (ATel #2270) to a bright (V = 15.1, R = 14.5, i' = 14.3, V-i' = 0.79) one on 2010-04-01 = MJD 55287 (with a very bright radio jet; ATel #2525).

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