Gorgone, N.

Hartmann, D.

Kennea, J.

Kouveliotou, C.

van der Horst, A.

Wijers, R.

Younes, G.

English

We observed the field centered on RA, DEC= 16h 20m 47.7s, -50d 01m 22.9son 10/26/2017 as part of our ongoing Deep Swift Galactic Plane SurveyLegacy project (Kouveliotou + 2016), with Swift/XRT in pc mode

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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)Brightening of MAXI J1621-501 as seen with Swift/XRTGorgone, N.; Younes, G.; Kouveliotou, C.; Kennea, J.; van der Horst, A.; Wijers, R.;Hartmann, D.; Swift Galactic Plane Survey Legacy teamPublication date2017Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Gorgone, N., Younes, G., Kouveliotou, C., Kennea, J., van der Horst, A., Wijers, R.,Hartmann, D., & Swift Galactic Plane Survey Legacy team (2017). Brightening of MAXIJ1621-501 as seen with Swift/XRT. The astronomer's telegram, 10969.http://www.astronomerstelegram.org/?read=10969General 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 #10969: Brightening of MAXI J1621-501 as seen with Swift/XRThttp://www.astronomerstelegram.org/?read=10969[4-5-2018 10:00:37]OutsideGCNIAUCsOther ATel on Twitter and FacebookATELstreamATel Community SitePost | Search | PoliciesCredential | Feeds | Email4 May 2018; 08:00 UTThis space for free for your conference.[ Previous | Next | ADS  ]Brightening of MAXI J1621-501 as seen with Swift/XRTATel #10969; N. Gorgone, G. Younes, C. Kouveliotou (GWU), J. Kennea (Penn State), A. vander Horst (GWU), R. Wijers (U Amsterdam), D. Hartmann (Clemson U) report on behalf of theSwift Galactic Plane Survey Legacy team:on 14 Nov 2017; 15:45 UTCredential Certification: Jamie A. Kennea (kennea@astro.psu.edu)Subjects: X-ray, Neutron Star, TransientReferred to by ATel #: 11067Tweet  We observed the field centered on RA, DEC= 16h 20m 47.7s, -50d 01m 22.9s on 10/26/2017 aspart of our ongoing Deep Swift Galactic Plane Survey Legacy project (Kouveliotou + 2016), withSwift/XRT in pc mode. The new transient source, MAXI J1621-501, resides within this field, asfirst reported in ATel #10869 (Hashimoto+) with follow up in ATels 10874 (Bahramian+) and10876 (Pessev). Our observation (Swift obsid 00087355002) started at 2017-10-26 07:25:09 UTand ended at 2017-10-26 07:34:53 UT with a total exposure of 567s. We fit the source spectrum (0.5-10 keV; corrected for pileup and background subtracted) usingtwo models: an absorbed power law (PL) and a disk blackbody (diskbb). For the first model, wefind an unabsorbed flux of F(0.5-10keV) = 1.43e-08 ergs/cm^2/s (corresponding to ~41 cts/s inSwift/XRT in the same band). This fit resulted in Chi Sq=1.30 for 72 degrees of freedom with fitparameters (90% confidence regions): N_H = (6.0+/- 0.3)*10^22 cm^-2 and power law index =2.3+/- 0.1.For the diskbb model we find an unabsorbed flux F(0.5-10keV) = 6.72e-09 ergs/cm^2/s with ChiSq= 1.4 for 69 degrees of freedom. Fit parameters are: N_H = (4.5 +/- 0.2)*10^22 cm^-2 and Tin= 2.0+/- 0.1 keV. In both cases, we note that the source flux has increased by a factor of ~6, 4 for the PL and diskbbmodels, respectively. This occurred over a timeframe of ~ 7 days between the first XRTobservation reported by Bahramian+ and our observation, indicating that the source is brighteningsignificantly. We also note a slight spectral softening in both models tested. Unfortunately, due tosolar constraints, most X-ray telescopes cannot follow up the source until about January 2018.We, therefore, strongly encourage radio follow up observations.Related11317 Identification of AX J1620.1-5002 with MAXI J1621-50111272 MAXI J1621-501 distanceinferred from type-I X-raybursts detected by JEM-X11252 INTEGRAL detection of X-raytransient source AX J1620.1-500211067 Detection of Type-I X-raybursts from MAXI J1621-50110969 Brightening of MAXI J1621-501 as seen with Swift/XRT10876 Archival Infrared Data on theNew Transient MAXI J1621-50110874 Swift confirmation andlocalization of the newTransient MAXI J1621-50110869 MAXI/GSC detection of apossible new X-ray novaMAXI J1621-501 on thegalactic planeRecommend 2ATel #10969: Brightening of MAXI J1621-501 as seen with Swift/XRThttp://www.astronomerstelegram.org/?read=10969[4-5-2018 10:00:37][ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, EditorMansi M. Kasliwal, Co-Editor

Brightening of MAXI J1621-501 as seen with Swift/XRT

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Brightening of MAXI J1621-501 as seen with Swift/XRT

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