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GX 339-4 going into optical/IR decline

ATel #270; Michelle Buxton, Charles Bailyn (Yale U)
on 16 Apr 2004; 22:03 UT
Credential Certification: Michelle Buxton (buxton@astro.yale.edu)

Subjects: Infra-Red, Optical, Binary, Black Hole, Transient

We have been continuously monitoring the black-hole candidate GX 339-4 with the ANDICAM instrument on the 1.3m CTIO telescope in optical and IR bands since the beginning of the latest outburst (ATEL #230, #231, #240). Recent observations indicate that the outburst is now in a declining phase. Our V- and J-band lightcurves may be viewed at http://www.astro.yale.edu/buxton/smarts/light_curves/gx339.html.

GX 339-4 lightcurves