Bogdanov, S.

Degenaar, N.

Deller, A.T.

Gusinskaia, N.V.

Hessels, J.W.T.

Jaodand, A.D.

Miller-Jones, J.C.A.

Russell, T.D.

English

IGR J17379-3747 is an accreting millisecond X-ray pulsar (AMXP). During its previous outburst in 2018, it revealed a few remarkable properties (Bult et al. 2019, ApJ, 877, 70B) that are similar to those of transitional millisecond pulsars (tMSPs) -- binary neutron stars that switch between being active as a radio millisecond pulsar and looking like an AMXP

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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)VLA radio non-detection of IGR J17379-3747 as the X-ray flux dropsGusinskaia, N.V.; Hessels, J.W.T.; Jaodand, A.D.; Miller-Jones, J.C.A.; Degenaar, N.; Deller,A.T.; Russell, T.D.; Bogdanov, S.Publication date2020Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Gusinskaia, N. V., Hessels, J. W. T., Jaodand, A. D., Miller-Jones, J. C. A., Degenaar, N.,Deller, A. T., Russell, T. D., & Bogdanov, S. (2020). VLA radio non-detection of IGR J17379-3747 as the X-ray flux drops. The astronomer's telegram, 14061.http://www.astronomerstelegram.org/?read=14061General 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:10 Mar 2023ATel #14061: VLA radio non-detection of IGR J17379-3747 as the X-ray flux dropshttp://www.astronomerstelegram.org/?read=14061[15-2-2021 14:04:47]OutsideGCNIAUCsOther ATel on Twitter and FacebookATELstreamATel Community SitePost | Search | PoliciesCredential | Feeds | Email15 Feb 2021; 13:04 UTThis space for free for your conference.[ Previous | Next | ADS  ]VLA radio non-detection of IGR J17379-3747 as the X-ray flux dropsATel #14061; N. V. Gusinskaia (University of Toronto), J. W.T. Hessels (ASTRON, Universityof Amsterdam), A. D. Jaodand (California Institute of Technology), J. C.A. Miller-Jones(Curtin University), N. Degenaar (University of Amsterdam), A. T. Deller (SwinburneUniversity of Technology), T. D. Russell (University of Amsterdam), S. Bogdanov (ColumbiaUniversity)on 3 Oct 2020; 12:45 UTCredential Certification: Jason W.T. Hessels (j.w.t.hessels@uva.nl)Subjects: Radio, X-ray, Neutron Star, Transient, PulsarIGR J17379-3747 is an accreting millisecond X-ray pulsar (AMXP). During its previous outburstin 2018, it revealed a few remarkable properties (Bult et al. 2019, ApJ, 877, 70B) that are similarto those of transitional millisecond pulsars (tMSPs) -- binary neutron stars that switch betweenbeing active as a radio millisecond pulsar and looking like an AMXP.Following the SRG/ART-XC report of a new outburst from IGR J17379-3747 on September 29th,2020 (ATel#14051), we triggered our joint Karl G. Jansky Very Large Array (VLA) and NeilGehrels Swift Observatory X-ray telescope (Swift-XRT) radio and X-ray monitoring programs, inwhich we aim to observe known tMSPs and tMSP candidates during their outbursts.We observed IGR J17379-3747 with VLA on September 30th, 2020 starting at 23:30 UTC. Theobservation was 1 hr long (with ~35 min on source); the data were recorded at X-band (8-12GHz) and the VLA was in B-configuration (X-band beam size of ~0.6 arcsec). The data werereduced and imaged using CASA (v.5.4.1; McMullin et al. 2007, ASPC, 376, 127).No radio emission was detected at the known position of IGR J17379-3747 (reported inATel#11487). The extracted flux density (~0.2 μJy) at the source position is consistent with theRMS noise of the image (~5 μJy), thus we set a 3-sigma upper limit of the source 10-GHz fluxdensity of 15.2 μJy, which translates into a (8-kpc, 5-GHz, assuming a flat spectrum) radioluminosity of LR < 1.3 x 1028 erg/s.Additionally, two Swift-XRT observations were performed that bracket our VLA observation.The first observation (obsid: 00031270035) was performed on September 30th, 2020 at 12:10Related14061 VLA radio non-detection ofIGR J17379-3747 as the X-rayflux drops14056 NICER detects pulsationsfrom a new outburst of theaccreting millisecond X-raypulsar IGR J17379-374714051 SRG/ART-XC detects anincreased activity from IGRJ17379-3747 - 468 HzAMXP/burster11520 X-ray re-brightening of theaccreting millisecond X-raypulsar IGR J17379-374711507 NICER discovers millisecondpulsations from the neutronstar LMXB IGR J17379-374711487 VLA radio detection of thevery-faint X-ray transient IGRJ17379-374711447 MAXI/GSC detection ofrenewed activity from thegamma-ray source IGRJ17379-37471714 Swift/XRT determines aprecise location for IGRJ17379-37471711 X-ray activity of IGR J17379-3747 confirmed withINTEGRAL1709 New and Old Outbursts ofIGR J17379-3747 ( = XTEJ1737-376)ATel #14061: VLA radio non-detection of IGR J17379-3747 as the X-ray flux dropshttp://www.astronomerstelegram.org/?read=14061[15-2-2021 14:04:47]UTC with 500 s exposure time. The second observation (obsid: 00013746001) was performed onOctober 1st, 2020 at 18:40 UTC with ~1300s exposure time. We derived unabsorbed fluxes of 1.8+/- 0.3 x 10-11 erg/s and 3 +/- 1 x 10-13 erg/s for the first and second observations, respectively(using the online XRT product tool, the spectral parameters reported in Bult. et al. 2019 andWebPIMMS). These fluxes correspond to 8-kpc, 1-10 keV X-ray luminosities of 1.4 +/- 0.3 x1035 erg/s and 2 +/- 0.7 x 1033 erg/s.Assuming a steady decay of flux between the two Swift-XRT observations, the X-ray luminosityat the time of our VLA observation can be interpolated to be 4 x 1034 erg/s. This puts our newVLA/Swift-XRT measurement in the radio/X-ray luminosity plane fainter in radio than black-hole low-mass X-ray binaries and consistent with radio measurements of other neutron star X-raybinaries.Our Swift-XRT observations, combined with SRG/ART-XC (ATel#14051) and NICER(ATel#14056) measurements, show that the source has been fading for the last 2.5 days. Duringits 2018 outburst, IGR J17379-3747 experienced a few significant re-brightenings after fadingfrom the peak of the outburst. Similarly, the most recent Swift-XRT observation (obsid:00013746002) indicates that the source's flux is rising again. Thus, we will likely continue Swift-XRT and VLA monitoring of IGR J17379-3747. Further multiwavelength observations areencouraged.We thank Tony Perrault, and the VLA and Swift-XRT staff, for making these VLA and Swift-XRT observations possible.[ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, Editor

VLA radio non-detection of IGR J17379-3747 as the X-ray flux drops

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VLA radio non-detection of IGR J17379-3747 as the X-ray flux drops

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