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GX 339-4 in a very low luminosity state

ATel #196; Elena Gallo, Rob Fender (U Amsterdam) & Stephane Corbel (U Paris VII & CEA Saclay)
on 3 Oct 2003; 15:48 UT
Credential Certification: Elena Gallo (egallo@science.uva.nl)

Subjects: Radio, X-ray, Black Hole, Transient

Referred to by ATel #: 230, 2270, 2281, 3383, 4247

A 30 ksec Chandra ACIS-S observation on MJD 52911 reveals the black hole X-ray binary GX 339-4 to have entered a very low luminosity state following a more than 2-year-long outburst period (ATEL #85, #95, #107, #120). The X-ray spectrum is well fitted by an absorbed power-law with photon index 2+/-0.2 and absorption column N_H=7+/-1x10e21 cm^-2. The (unabsorbed) 0.4-11 keV flux is of 3.8e-13 erg sec^-1 cm^-2, with a corresponding luminosity of 4.6e31x(d/kpc)^2 erg sec^-1, comparable to the faintest ever measured from GX 339-4. Simultaneous radio observations with the Australia Telescope Compact Array did not detect the source to an rms noise level of 0.015 mJy/beam at 4.8 GHz.

Related
15615 AstroSat/SXT confirms GX 339-4 to be in the low-hard state
15598 Optical observations of the outburst of the black-hole low-mass X-ray binary GX 339-4 with LCO
14507 ATCA observations of radio flaring emission from GX 339-4 during the current hard-to-soft state transition
14504 Insight-HXMT detection of the hard-to-soft state transition in the black hole binary GX339-4
14494 Ongoing state transition of the BH XRB GX 339-4 confirmed in the optical by XB-NEWS
14493 A descriptive title
14490 NICER X-ray activity shows GX 339-4 undergoing a rapid state transition
14484 Detection of Low Frequency QPO in GX 339-4 with NuSTAR
14455 AstroSat observations during prolonged hard state of 2021 outburst of GX 339-4
14440 GX 339-4: INTEGRAL observations in the bright hard state
14419 Optical monitoring of GX 339-4 suggests the source is approaching state transition
14400 Follow up observations of GX 339-4 with AstroSat
14384 NICER X-ray activity indicates GX 339-4 rising in hard state
14354 INTEGRAL hard X-ray detection of a new outburst from GX339-4
14352 Increased X-ray activity for the black hole binary GX 339-4 detected with NuSTAR and Swift/XRT
14351 Detection of X-ray flaring activity from GX 339-4 using Swift
14336 MeerKAT observations revealed a rapid rising outburst of the recurrent black hole GX339-4
13113 GX 339-4 may have reached the peak of its rebrightening
10797 New outburst of GX 339-4 detected by Faulkes Telescope South
7649 GX 339-4 has entered the intermediate state
7434 GX 339-4 is still in the soft state
7201 GX 339-4 has left the soft state and possibly entered the intermediate state
7009 Soft state of GX 339-4 in its 2014-2015 outburst
6960 Possible ongoing hard-to-soft transition of GX 339-4
5594 Swift X-ray observations indicate that the 2013 outburst of GX 339-4 is probably ending
5417 GX 339-4 remains in the hard state
5285 ATCA radio detection of GX 339-4 in the rising hard state
5252 Swift X-ray observations confirm outburst of GX 339-4
5244 New outburst of the black-hole X-ray binary GX 339-4
4247 The rapid extreme fading of GX 339-4
4162 GX 339-4 is rising into outburst, and a deep optical quiescent magnitude observed by Faulkes Telescope South
3383 GX 339-4 is back in a faint state close to quiescence
3191 GX 339-4 back in the hard state: optical observations reveal the return of the jet
3117 GX 339-4 in transition towards hard states
2871 Aql X-1 in brightest outburst since 2003
2745 Witnessing with the ATCA the interaction of a relativistic jet from GX 339-4 with the interstellar medium
2593 Multiple fast state transitions in GX 339-4
2577 Transition to the soft state in GX 339-4
2573 Simultaneous INTEGRAL, RXTE, Swift and FT South observations of the transition of GX 339-4
2556 Three Harmonics of X-ray Quasi-periodic Oscillation seen in Swift/XRT and RXTE/PCA Observations of GX 339-4
2549 IR brightening and possible appearance of the compact jet in XTE J1752-223 in the hard state
2547 Optical/IR flux fading rapidly in GX 339-4: OIR jet quenching
2545 GX 339-4 in transition from the hard state
2525 Observations with the ATCA of the brightest known radio hard state in GX 339-4
2523 GX 339-4 variability evolution observed by RXTE suggests the start of a spectral transition
2459 Optical Observations of GX 339-4 in Outburst with the Faulkes Telescope South
2455 INTEGRAL observes an increasing Hard X-ray flux of GX 339-4
2384 RXTE observes hard state activity from GX 339-4
2380 MAXI/GSC detection of an X-ray activity from GX 339-4
2281 A recent Swift/XRT observation of GX 339-4 during its faint optical flux
2270 GX 339-4 Approaching Quiescence ?
1962 Optical photometry and polarimetry of GX 339-4 during its outburst rise
1960 MOST Observations of GX 339-4
1954 Renewed activity from GX 399-4
1951 Swift and INTEGRAL observations of SAX J1747.0-2853
1945 Recent PCA Measurements of SAX J1747.0-2853 and GX 339-4
1944 INTEGRAL detects an X-ray burst from SAX J1747.0-2853 with no detectable persistent emission
1588 Recent Swift XRT Observations of GX 339-4
1586 Unusual optical and X-ray flaring activity in GX 339-4
1027 Latest optical and infrared observations of GX 339-4
968 Swift-BAT detects a bright hard X-ray outburst from GX 339-4
944 Renewed Low Level X-ray Activity of GX 339-4
707 X-ray activity in GX 339-4
455 State transition of GX 339-4
270 GX 339-4 going into optical/IR decline
243 IR-brightening of GX339-4
240 GX 339-4 detected with INTEGRAL
236 Continued birghtening of GX 339-4 in X-rays
231 Renewed X-ray activity in GX 339-4
230 Increased radio and optical activity in GX 339-4
196 GX 339-4 in a very low luminosity state
120 State Transition of GX 339-4
107 The recent evolution of radio emission from GX 339-4
95 State Changes in GX 339-4
85 Outburst of GX 339-4