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

Gorgone, N.

Hartmann, D.

Kennea, J.

Kouveliotou, C.

Swift Galactic Plane Survey Legacy Team

van der Horst, A.

Wijers, R.

Younes, G.

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)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

English

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

NARCIS 

UvA-DARE

Swift Galactic Plane Survey Legacy Team,

Search4Dev

UvA-DARE is a service provided by the library of the University of Amsterdam (http://dare.uva.nl)
UvA-DARE (Digital Academic Repository)
Brightening of MAXI J1621-501 as seen with Swift/XRT
Gorgone, N.; Younes, G.; Kouveliotou, C.; Kennea, J.; van der Horst, A.; Wijers, R.;
Hartmann, D.; Swift Galactic Plane Survey Legacy Team
Published in:
The astronomer's telegram
Link to publication
License
Unspecified
Citation 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 MAXI J1621-501 as seen with Swift/XRT. The
astronomer's telegram, 10969. http://www.astronomerstelegram.org/?read=10969
General rights
It 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 open content license (like Creative Commons).
Disclaimer/Complaints regulations
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating
your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask
the Library: https://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam,
The Netherlands. You will be contacted as soon as possible.
Download date: 04 Feb 2021
ATel #10969: Brightening of MAXI J1621-501 as seen with Swift/XRT
http://www.astronomerstelegram.org/?read=10969[4-5-2018 10:00:37]
Outside
GCN
IAUCs
Other 
ATel on Twitter and Facebook
ATELstream
ATel Community Site
Post | Search | Policies
Credential | Feeds | Email
4 May 2018; 08:00 UT
This space for free for your conference.
[ Previous | Next | ADS  ]
Brightening of MAXI J1621-501 as seen with Swift/XRT
ATel #10969; N. Gorgone, G. Younes, C. Kouveliotou (GWU), J. Kennea (Penn State), A. van
der Horst (GWU), R. Wijers (U Amsterdam), D. Hartmann (Clemson U) report on behalf of the
Swift Galactic Plane Survey Legacy team:
on 14 Nov 2017; 15:45 UT
Credential Certification: Jamie A. Kennea (kennea@astro.psu.edu)
Subjects: X-ray, Neutron Star, Transient
Referred to by ATel #: 11067
Tweet  
We observed the field centered on RA, DEC= 16h 20m 47.7s, -50d 01m 22.9s on 10/26/2017 as
part of our ongoing Deep Swift Galactic Plane Survey Legacy project (Kouveliotou + 2016), with
Swift/XRT in pc mode. The new transient source, MAXI J1621-501, resides within this field, as
first reported in ATel #10869 (Hashimoto+) with follow up in ATels 10874 (Bahramian+) and
10876 (Pessev). Our observation (Swift obsid 00087355002) started at 2017-10-26 07:25:09 UT
and 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) using
two models: an absorbed power law (PL) and a disk blackbody (diskbb). For the first model, we
find an unabsorbed flux of F(0.5-10keV) = 1.43e-08 ergs/cm^2/s (corresponding to ~41 cts/s in
Swift/XRT in the same band). This fit resulted in Chi Sq=1.30 for 72 degrees of freedom with fit
parameters (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 Chi
Sq= 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 diskbb
models, respectively. This occurred over a timeframe of ~ 7 days between the first XRT
observation reported by Bahramian+ and our observation, indicating that the source is brightening
significantly. We also note a slight spectral softening in both models tested. Unfortunately, due to
solar constraints, most X-ray telescopes cannot follow up the source until about January 2018.
We, therefore, strongly encourage radio follow up observations.
Related
11317 Identification of AX J1620.1-
5002 with MAXI J1621-501
11272 MAXI J1621-501 distance
inferred from type-I X-ray
bursts detected by JEM-X
11252 INTEGRAL detection of X-ray
transient source AX J1620.1-
5002
11067 Detection of Type-I X-ray
bursts from MAXI J1621-501
10969 Brightening of MAXI J1621-
501 as seen with Swift/XRT
10876 Archival Infrared Data on the
New Transient MAXI J1621-
501
10874 Swift confirmation and
localization of the new
Transient MAXI J1621-501
10869 MAXI/GSC detection of a
possible new X-ray nova
MAXI J1621-501 on the
galactic plane
Recommend 2
ATel #10969: Brightening of MAXI J1621-501 as seen with Swift/XRT
http://www.astronomerstelegram.org/?read=10969[4-5-2018 10:00:37]
[ Telegram Index ]
R. E. Rutledge, Editor-in-Chief
Derek Fox, Editor
Mansi M. Kasliwal, Co-Editor


https://pure.uva.nl/ws/files/24740114/Brightening_of_MAXI_J1621_501.pdf

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

Abstract

Similar works

Full text

Available Versions

International Migration, Integration and Social Cohesion online publications

NARCIS

UvA-DARE

International Migration, Integration and Social Cohesion online publications

Search4Dev