Rouco Escorial, A.

Wijnands, R.

English

On 2016 May 17, the Be/X-ray transient GX 30-41 was found (using MAXIand BAT) to exhibit a new outburst although this was not yet expected based on the previous outbursts of the source (Atel #9064)

International Migration, Integration and Social Cohesion online publications

UvA-DARE is a service provided by the library of the University of Amsterdam (https://dare.uva.nl)UvA-DARE (Digital Academic Repository)Swift monitoring observation of the Be/X-ray transient GX 304-1 in quiescenceand its current outburstRouco Escorial, A.; Wijnands, R.Publication date2016Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Rouco Escorial, A., & Wijnands, R. (2016). Swift monitoring observation of the Be/X-raytransient GX 304-1 in quiescence and its current outburst. The astronomer's telegram, 9101.http://www.astronomerstelegram.org/?read=9101General 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:09 Mar 2023ATel #9101: Swift monitoring observation of the Be/X-ray transient GX 304-1 in quiescence and its current outbursthttp://astronomerstelegram.org/?read=9101[13-7-2020 14:40:25]OutsideGCNIAUCsOther ATel on Twitter and FacebookATELstreamATel Community SitePost | Search | PoliciesCredential | Feeds | Email13 Jul 2020; 12:39 UTThis space for free for your conference.[ Previous | Next | ADS  ]Swift monitoring observation of the Be/X-ray transientGX 304-1 in quiescence and its current outburstATel #9101; A. Rouco Escorial, R. Wijnands (Amsterdam)on 31 May 2016; 07:41 UTDistributed as an Instant Email Notice TransientsCredential Certification: Rudy Wijnands (rudy@space.mit.edu)Subjects: X-ray, Binary, Neutron Star, TransientOn 2016 May 17, the Be/X-ray transient GX 30-41 was found (using MAXI and BAT) to exhibita new outburst although this was not yet expected based on the previous outbursts of the source(Atel #9064). This new outburst was also detected using INTEGRAL (Atel #9067). We have beenmonitoring GX 304-1 after the end of its previous outburst (Atel #8592; first detected on 2016January 24) using the X-ray telescope aboard Swift to study the source behavior in quiescenceand to catch the early phase of the next outburst. We found that the flux decayed (measured usingan absorbed power-law model) from 1.4E-10 erg/s/cm-2 (0.5-10 keV, all quoted fluxes areunabsorbed fluxes) on February 5 to 7.3E-11 erg/s/cm-2 on February 17 after which it slowlydecreased to 4.4E-11 erg/s/cm-2 on April 28 (although with flux variations of a factor of a fewwere observed during this decaying phase). The column density nh varied between 0.9E22 and1.7E22 cm-2 and the photon index (gamma) between 1 and 1.6 (although we note that, due to theoften low number of photons detected, the errors could be significant, up to 0.7). On 2016 May 7,the source suddenly increased its flux to 2.7E-10 erg/s/cm-2 (nh = 1.3+/-0.3 cm-2; gamma1.1+/-0.2) indicating that the current outburst started between April 28 and May 7. Since then wehave obtained several additional observations of the source using Swift/XRT and it flux hasincreased to 6.8E-10 erg/s/cm-2 (nh = 1.6+/-0.6 cm-2; gamma 0.9+/-0.3) during our lastobservation obtained on 24 May. We continue to monitor the source using the Swift/XRT tofurther study its outburst behavior. We thank Neil Gehrels for approving our monitoringobservations of GX 304-1.GX 304-1 Swift/BAT transient lightcurveRelated9101 Swift monitoring observationof the Be/X-ray transient GX304-1 in quiescence and itscurrent outburst9067 INTEGRAL detection of theon-going activity from the BeHMXB GX 304-19064 MAXI/GSC detection of a weakX-ray activity from Be/X-raybinary pulsar GX 304-18592 MAXI/GSC detection of theoutburst onset from Be/X-raybinary pulsar GX 304-18055 MAXI/GSC detection of the X-ray outbursts from Be/X-raybinary pulsars, GX 304-1 andA 0535+268024 Rise in optical activity ofHDE245770/A0535+26 system7441 MAXI/GSC detection of anonset of X-ray brighteningfrom Be/X-ray binary pulsarGX 304-17015 MAXI/GSC detection of theonset of the outburst fromBe/X-ray binary pulsarA0535+265782 INTEGRAL/IBIS detectsrenewed activity from H 1417-6244420 MAXI/GSC detection of anoutburst from Be/X-ray binarypulsar GX 304-13856 MAXI/GSC detects the onsetof a recurrent outburst of GX304-13624 MAXI/GSC detects the onsetof a recurrent outburst of GX304-13309 MAXI/GSC detected arenewed X-ray activity fromGX 304-12297 MAXI/GSC detection of anoutburst from GX 304-12277 Renewed activity of A0535+26detected by MAXI/GSC2276 Swift/BAT confirms theoutburst from 2S 1417-6242275 2S 1417-624 in OutburstATel #9101: Swift monitoring observation of the Be/X-ray transient GX 304-1 in quiescence and its current outbursthttp://astronomerstelegram.org/?read=9101[13-7-2020 14:40:25]1613 INTEGRAL hard X-raydetection of HMXB GX 304-1and H 1417-624[ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, EditorMansi M. Kasliwal, Co-Editor

Swift monitoring observation of the Be/X-ray transient GX 304-1 in quiescence and its current outburst

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Swift monitoring observation of the Be/X-ray transient GX 304-1 in quiescence and its current outburst

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