Altamirano, D.

Armas Padilla, M.

Degenaar, N.D.

Kaur, R.

Wijnands, R.

Yang, Y.J.

English

Following reports of renewed activity of the transient neutron star low-mass X-ray binary SAX J1806.5-2215 (ATel #3193), we obtained a ~1 ks Swift/XRT pointing of the source field on 2011 March 1. The observation was carried out in the PC mode and reveals one relatively bright X-ray source within the XRT field of view. For this object, we find an astrometrically corrected X-ray position (using the method described by Evans et al

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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)Swift/XRT localization of the neutron star X-ray transient SAX J1806.5-2215Degenaar, N.D.; Altamirano, D.; Armas Padilla, M.; Kaur, R.; Wijnands, R.; Yang, Y.J.Publication date2011Document VersionFinal published versionPublished inThe astronomer's telegramLicenseUnspecifiedLink to publicationCitation for published version (APA):Degenaar, N. D., Altamirano, D., Armas Padilla, M., Kaur, R., Wijnands, R., & Yang, Y. J.(2011). Swift/XRT localization of the neutron star X-ray transient SAX J1806.5-2215. Theastronomer's telegram, 3202. https://www.astronomerstelegram.org/?read=3202General 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 #3202: Swift/XRT localization of the neutron star X-ray transient SAX J1806.5-2215https://www.astronomerstelegram.org/?read=3202[14-10-2022 15:21:35]OutsideGCNIAUCs ATel on TwitterPatreonPost | Search | PoliciesCredential | Feeds | Email14 Oct 2022; 13:21 UTThis space for free for your conference.[ Previous | Next | ADS  ]Swift/XRT localization of the neutron star X-ray transientSAX J1806.5-2215ATel #3202; N. Degenaar, D. Altamirano, M. Armas Padilla, R. Kaur, R. Wijnands, Y.J. Yang (University of Amsterdam)on 2 Mar 2011; 18:38 UTCredential Certification: Nathalie Degenaar (degenaar@uva.nl)Subjects: X-ray, Binary, Neutron Star, TransientReferred to by ATel #: 3210, 3218, 3219, 3381, 3926, 4017TweetFollowing reports of renewed activity of the transient neutron star low-mass X-ray binarySAX J1806.5-2215 (ATel #3193), we obtained a ~1 ks Swift/XRT pointing of the sourcefield on 2011 March 1. The observation was carried out in the PC mode and reveals onerelatively bright X-ray source within the XRT field of view. For this object, we find anastrometrically corrected X-ray position (using the method described by Evans et al.2009, MNRAS 397, 1177) of RA, Dec = 271.63564, -22.23767 deg, which is equivalentto RA, DEC (J2000) = 18 06 32.55, -22 14 15.6, with an uncertainty of 2.0 arcsec(radius, 90% confidence). This position lies ~1 arcmin from the BeppoSAX/WFCcoordinates of SAX J1806.5-2215, which is well within the estimated ~2.9 arcminBeppoSAX/WFC error circle.The XRT spectrum (corrected for pile-up) can be fitted to an absorbed powerlaw modelwith Nh~(5.6+/-1.8)E22 cm-2 and an index of ~2.0+/-0.5. The deduced absorbed andunabsorbed fluxes in the 2-10 keV energy band are ~1.6E-10 and 2.7E-10 erg cm-2 s-1,respectively. For a distance of 8 kpc (the upper limit derived from type-I X-ray burstanalysis; Cornelisse et al. 2002, A&A 392, 931), the unabsorbed flux translates into a 2-10 keV luminosity of ~2E36 erg s-1.SAX J1806.5-2215 was discovered with the WFC aboard BeppoSAX in 1996 through thedetection of type-I X-ray bursts (in 't Zand et al. 1998, NuPhS 69, 228). The WFCdetected two of these bursts, in 1996 August and in 1997 March. Although BeppoSAXcould not detect any persistent emission at that time, RXTE/ASM observations suggestthat the source was active from early-1996 till late-1997 at a 2-10 keV luminosity of~1E36 erg/s (Cornelisse et al. 2002, A&A 392, 931). Apart from this long outburst, noactivity is seen in the RXTE/ASM lightcurve, nor in the RXTE/PCA bulge scans (seeRelated8222 INTEGRAL detection of thefaint X-ray transient SAXJ1806.5-22154017 New INTEGRAL and Swiftobservations of the faintneutron-star X-ray transientSAX J1806.5-22153926 New Swift/XRT observationshows faint X-ray transientSAX J1806.5-2215 remainsactive 1 year after outburst3381 Type-I X-ray bursts from SAXJ1806.5-2215 with RXTE3268 Candidate near-infraredcounterpart to the fainttransient neutron star X-raybinary SAX J1806.5-22153219 Improved Swift-XRT positionof SAX J1806.5-22153218 Chandra Localization of SAXJ1806.5-22153210 First hard X-ray detection ofthe neutron star X-raytransient SAX J1806.5-2215with INTEGRAL3202 Swift/XRT localization of theneutron star X-ray transientSAX J1806.5-22153193 Possible outburst in neutronstar LMXB SAX J1806.5-2215ATel #3202: Swift/XRT localization of the neutron star X-ray transient SAX J1806.5-2215https://www.astronomerstelegram.org/?read=3202[14-10-2022 15:21:35]ATel #3193). This suggests that SAX J1806.5-2215 resided in quiescence for nearly 15years (at least, no similarly long, bright outbursts occurred since 1997). The intensitylevel detected during our Swift/XRT observation is similar to that seen by RXTE/ASM in1996/1997.There is no quiescent counterpart detected at the refined source position in an archivalChandra observation obtained in 2001 October (Cornelisse et al. 2002, A&A 392, 931).Applying the prescription for low number statistics given by Gehrels (ApJ 303, 1986), weplace a 90% confidence upper limit on the unabsorbed quiescent 0.5-10 keV luminosityof ~(0.5-1)E33 erg s-1 for D=8 kpc (using webpimms with a hydrogen column density ofNh=5.6E22 cm-2 and two different models: a powerlaw of index 2.0 and a blackbody oftemperature 0.3 keV). Previous Swift/XRT observations of the source field obtained in2006 October, 2007 February (Campana 2009, ApJ 699, 1144) and 2010 June did notdetect a source at the XRT position obtained for SAX J1806.5-2215. This implies that the0.5-10 keV source luminosity was roughly below ~2E33 erg s-1 on those dates.Follow-up observations, particularly at other wavelengths, are strongly encouraged.We thank the Swift team for making this observation possible. This work made use ofdata supplied by the UK Swift Science Data Centre at the University of Leicester.[ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, Editor

Swift/XRT localization of the neutron star X-ray transient SAX J1806.5-2215

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Swift/XRT localization of the neutron star X-ray transient SAX J1806.5-2215

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