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ATCA radio observations of GX 339-4

ATel #1007; S. Corbel (CEA Saclay & Univ Paris 7), T. Tzioumis (ATNF), C. Brocksopp (MSSL) and R. Fender (Univ Southampton).
on 20 Feb 2007; 11:10 UT
Distributed as an Instant Email Notice Transients
Credential Certification: S. CORBEL (corbel@discovery.saclay.cea.fr)

Subjects: Radio, Request for Observations, Black Hole, Transient

Referred to by ATel #: 1058

Following the recent reactivation of GX 339-4 in X-rays as detected by INTEGRAL (see ATel #1000), we have conducted several radio observations with the Australia Telescope Compact Array (ATCA) located in Narrabri, Australia. We report the results of the observations (at 3.5 and 6 cm) covering the period from February 4 to February 18. GX 339-4 has been detected in all radio observations and is very variable on timescale of days with flux density ranging from 1 to 25 mJy. The spectral shape also changes over time ranging from flat to very steep spectrum, likely suggesting that GX 339-4 is currently undergoing a series of plasma ejection events (similar to the oscillations a la GRS 1915+105).