Fridriksson, J.K.

Homan, J.

Lewis, F.

O'Morain, C.

Roche, P.

Russell, D.M.

English

The black hole candidate GX 339-4 has spent more than one year in outburst. It entered outburst in 2010 January (ATel #2380, #2384), brightened in the hard state (ATel #2455, #2459, #2525) before making a transition to the soft state in 2010 April - May (ATel #2545, #2547, #2573, #2577, #2593) and finally returned to the hard state in 2011 January - February (ATel #3117, #3191)

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UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl)UvA-DARE (Digital Academic Repository)GX 339-4 is back in a faint state close to quiescenceRussell, D.M.; Homan, J.; Fridriksson, J.K.; Lewis, F.; Roche, P.; O'Morain, C.Publication date2011Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Russell, D. M., Homan, J., Fridriksson, J. K., Lewis, F., Roche, P., & O'Morain, C. (2011). GX339-4 is back in a faint state close to quiescence. The astronomer's telegram, 3383.https://www.astronomerstelegram.org/?read=3383General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s)and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an opencontent license (like Creative Commons).Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, pleaselet the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the materialinaccessible and/or remove it from the website. Please Ask the Library: https://uba.uva.nl/en/contact, or a letterto: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. Youwill be contacted as soon as possible.Download date:31 Aug 2023ATel #3383: GX 339-4 is back in a faint state close to quiescencehttps://www.astronomerstelegram.org/?read=3383[24-7-2023 14:33:19]ATel OnPatreonMastodonTwitterPost | Search | PoliciesCredential | Feeds | Email24 Jul 2023; 12:33 UTThis space for free for your conference.[ Previous | Next | ADS  ]GX 339-4 is back in a faint state close to quiescenceATel #3383; D. M. Russell (University of Amsterdam), J. Homan, J. K. Fridriksson(MIT), F. Lewis, P. Roche (Univ. of Glamorgan, Faulkes Telescope Project, OpenUniv.), C. O'Morain (Univ. of Glamorgan)on 27 May 2011; 15:26 UTCredential Certification: David M. Russell (D.M.Russell@uva.nl)Subjects: Optical, X-ray, Binary, Black Hole, TransientReferred to by ATel #: 4162, 5252TweetThe black hole candidate GX 339-4 has spent more than one year in outburst. It enteredoutburst in 2010 January (ATel #2380, #2384), brightened in the hard state (ATel #2455,#2459, #2525) before making a transition to the soft state in 2010 April - May (ATel#2545, #2547, #2573, #2577, #2593) and finally returned to the hard state in 2011January - February (ATel #3117, #3191). We report here on recent Swift X-ray and Faulkes Telescope optical observations of GX339-4. The source has returned to a faint state, close to quiescence. Two recent ~5 ks Swift XRT observations of GX 339-4 on 2011 May 11 and May 17indicate unabsorbed 0.5-10 keV fluxes of 5.6e-13 erg sec^-1 cm^-2 and 7.2e-13 ergsec^-1 cm^-2, with estimated uncertainties of ~25%. The spectra were fitted with anabsorbed power-law, with the Nh fixed at 7e21 cm^-2 and the power-law index fixed at 2(see ATel #196). The last time GX 339-4 was this faint was in 2009 November, when its0.3-10 keV flux was 8e-13 erg sec^-1 cm^-2 (ATel #2281) which is a factor of 2 highercompared to the faintest recorded in 2003 (ATel #196). Our monitoring of GX 339-4 with the Faulkes Telescope South (located at Siding Spring,Australia) reveals a gradually fading and reddening optical counterpart, decreasing inRelated15615 AstroSat/SXT confirms GX339-4 to be in the low-hardstate15598 Optical observations of theoutburst of the black-holelow-mass X-ray binary GX339-4 with LCO14953 GX 339-4 in transition backto the hard state with thecompact jets in formation14563 Aquila X-1 returns toquiescence : opticalmonitoring of the 2021outburst14507 ATCA observations of radioflaring emission from GX339-4 during the currenthard-to-soft state transition14504 Insight-HXMT detection ofthe hard-to-soft statetransition in the black holebinary GX339-414494 Ongoing state transition ofthe BH XRB GX 339-4confirmed in the optical byXB-NEWS14493 A descriptive title14490 NICER X-ray activity showsGX 339-4 undergoing a rapidstate transition14484 Detection of Low FrequencyQPO in GX 339-4 withNuSTAR14455 AstroSat observationsduring prolonged hard stateof 2021 outburst of GX 339-414440 GX 339-4: INTEGRALobservations in the brighthard state14419 Optical monitoring of GX339-4 suggests the source isapproaching state transition14400 Follow up observations ofGX 339-4 with AstroSat14384 NICER X-ray activityindicates GX 339-4 rising inhard state14367 Detection of softening of X-ray flare from GX 339-4 usingMAXI/GSC14354 INTEGRAL hard X-raydetection of a new outburstfrom GX339-414352 Increased X-ray activity forthe black hole binary GX339-4 detected with NuSTARand Swift/XRTATel #3383: GX 339-4 is back in a faint state close to quiescencehttps://www.astronomerstelegram.org/?read=3383[24-7-2023 14:33:19]flux by a factor ~ 40 (15) in V-band (i'-band) over the last eight months. The V-bandmagnitudes were V ~ 16.0 on 2010 September 28, V ~ 17.1 on 2011 February 23 (ATel#3191), V ~ 18.4 on 2011 April 4 and V ~ 19.1 on 2011 April 26 (errors are < 0.1 mag).The magnitudes from our most recent observations on 2011 May 19 and May 20 were V~ 19.4 - 20.1, R ~ 18.9 and i' ~ 18.4 - 18.9 from 2, 2 and 20 images, respectively. The last time GX 339-4 was this faint in optical was in ~ 2009 October (ATel #2270).Two faint, close field stars shown in Shahbaz et al. (2001) lie within the aperture. Thesetwo stars are marginally resolved from GX 339-4 in some of the R and i'-band images,and the X-ray binary is clearly fainter than the combination of these two stars, so themagnitude of GX 339-4 itself is R > 19.7; i' > 19.2. This is consistent with the lowestmagnitude reported; r = 20.1 (Shahbaz et al. 2001). The fractional rms variabilityamplitude from the 19 i'-band images spread over 5.5 hours on 2011-05-20 was 11 +- 5% (a 2.2 sigma detection of variability). Any intrinsic variability will be suppressed by thetwo close stars, so if real, this variability is likely to be >> 11 %, implying significantaccretion activity at low luminosity. We thank the Swift team for scheduling the X-ray observations. We also thank thefollowing Faulkes Telescope Users for observing GX 339-4 on 2011-05-20: RebeccaScobie (Charles Dickens School, Broadstairs, England), Thomas Doyle (FreeportSchools, New York, USA) and Ana Costa (Escola ES de Alvide, Portugal). The FaulkesTelescope observations are part of an on-going monitoring campaign of ~ 30 low-massX-ray binaries (Lewis et al. 2008). The Faulkes Telescope South is maintained andoperated by Las Cumbres Observatory Global Telescope Network. FL acknowledgessupport from the Dill Faulkes Educational Trust.Faulkes light curves of GX 339-414351 Detection of X-ray flaringactivity from GX 339-4 usingSwift14336 MeerKAT observationsrevealed a rapid risingoutburst of the recurrentblack hole GX339-413953 XB-NEWS detects a newoutburst from Aquila X-113451 XB-NEWS detection of a newoutburst of MAXI J1348-63013113 GX 339-4 may have reachedthe peak of its rebrightening12322 NuSTAR confirms a newoutburst for the Black HoleBinary GX 339-412287 MeerKAT observationsrevealed a rising outburst ofthe recurrent black hole GX339-411208 Swift XRT observes GX 339-4in the hard state in Jan 201810864 SALT high resolutionspectroscopy of GX339-4 inoutburst10825 NuSTAR Observation of GX339-4 in the early stages ofits 2017 outburst10820 Sub-second optical flaring inGX 339-4 during the 2017outburst early rise10808 Radio detection of GX 339-4in its latest outburst10798 X-ray brightening of GX 339-4 in late September 201710797 New outburst of GX 339-4detected by FaulkesTelescope South9306 Faulkes Telescopeobservations of the opticalrise of a bright outburst ofAql X-17977 SMARTS optical re-brightening of GX 339-47962 GX 339-4 in transition backto the hard state after a longoutburst7649 GX 339-4 has entered theintermediate state7434 GX 339-4 is still in the softstate7201 GX 339-4 has left the softstate and possibly enteredthe intermediate state7009 Soft state of GX 339-4 in its2014-2015 outburst6960 Possible ongoing hard-to-soft transition of GX 339-46649 Swift/BAT detects of a newX-ray outburst of GX 339-45594 Swift X-ray observationsindicate that the 2013outburst of GX 339-4 isprobably ending5417 GX 339-4 remains in the hardstate5285 ATCA radio detection of GX339-4 in the rising hard state5252 Swift X-ray observationsconfirm outburst of GX 339-45244 New outburst of the black-hole X-ray binary GX 339-44247 The rapid extreme fading ofGX 339-44162 GX 339-4 is rising intooutburst, and a deep opticalquiescent magnitudeobserved by FaulkesTelescope South3383 GX 339-4 is back in a faintstate close to quiescenceATel #3383: GX 339-4 is back in a faint state close to quiescencehttps://www.astronomerstelegram.org/?read=3383[24-7-2023 14:33:19]3191 GX 339-4 back in the hardstate: optical observationsreveal the return of the jet3117 GX 339-4 in transitiontowards hard states2911 Radio non-detection of AqlX-12902 RXTE/PCA detection of QPOnear 0.22 Hz in Aql X-1during ongoing outburst2891 Optical MonitoringObservations of AQL X-12871 Aql X-1 in brightest outburstsince 20032850 Outburst of Aql X-1 asobserved by RXTE and Swift2775 XTE J1752-223 has faded toquiescence: optical andinfrared magnitudes2748 Further Optical Observationsof Aql X-12745 Witnessing with the ATCAthe interaction of arelativistic jet from GX 339-4with the interstellar medium2744 X-ray, UV, Optical and NIRObservations of Aql X-12742 New X-ray Activity from AqlX-12593 Multiple fast state transitionsin GX 339-42577 Transition to the soft state inGX 339-42573 Simultaneous INTEGRAL,RXTE, Swift and FT Southobservations of thetransition of GX 339-42556 Three Harmonics of X-rayQuasi-periodic Oscillationseen in Swift/XRT andRXTE/PCA Observations ofGX 339-42549 IR brightening and possibleappearance of the compactjet in XTE J1752-223 in thehard state2547 Optical/IR flux fading rapidlyin GX 339-4: OIR jetquenching2545 GX 339-4 in transition fromthe hard state2525 Observations with the ATCAof the brightest known radiohard state in GX 339-42523 GX 339-4 variabilityevolution observed by RXTEsuggests the start of aspectral transition2518 XTE J1752-223 in transitionfrom a soft to a hard state2459 Optical Observations of GX339-4 in Outburst with theFaulkes Telescope South2455 INTEGRAL observes anincreasing Hard X-ray flux ofGX 339-42384 RXTE observes hard stateactivity from GX 339-42380 MAXI/GSC detection of an X-ray activity from GX 339-42288 Aql X-1 back in outburst:multi-wavelengthobservations2281 A recent Swift/XRTobservation of GX 339-4during its faint optical flux2270 GX 339-4 ApproachingQuiescence ?2269 XTE J1752-223: RXTE PCAObservation shows blackhole candidateATel #3383: GX 339-4 is back in a faint state close to quiescencehttps://www.astronomerstelegram.org/?read=3383[24-7-2023 14:33:19]1970 Optical and hard X-raydetections of an outburstfrom Aquila X-11962 Optical photometry andpolarimetry of GX 339-4during its outburst rise1960 MOST Observations of GX339-41954 Renewed activity from GX399-41951 Swift and INTEGRALobservations of SAXJ1747.0-28531945 Recent PCA Measurementsof SAX J1747.0-2853 and GX339-41944 INTEGRAL detects an X-rayburst from SAX J1747.0-2853with no detectable persistentemission1588 Recent Swift XRTObservations of GX 339-41586 Unusual optical and X-rayflaring activity in GX 339-41218 Optical and Near-IRObservations of the CurrentOutburst of Aql X-11027 Latest optical and infraredobservations of GX 339-4968 Swift-BAT detects a brighthard X-ray outburst from GX339-4944 Renewed Low Level X-rayActivity of GX 339-4707 X-ray activity in GX 339-4455 State transition of GX 339-4270 GX 339-4 going intooptical/IR decline243 IR-brightening of GX339-4240 GX 339-4 detected withINTEGRAL231 Renewed X-ray activity in GX339-4230 Increased radio and opticalactivity in GX 339-4196 GX 339-4 in a very lowluminosity state120 State Transition of GX 339-4107 The recent evolution of radioemission from GX 339-495 State Changes in GX 339-485 Outburst of GX 339-4[ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, Editor

GX 339-4 is back in a faint state close to quiescence

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GX 339-4 is back in a faint state close to quiescence

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