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Confirmation of the NIR counterparts to SLX 1746-331 and XTE J1810-189

ATEL # 1633; M.A.P. Torres (CfA), D. Steeghs (Warick/CfA), P. G. Jonker (SRON/CfA), M. R. Garcia (CfA), J. E. McClintock (CfA), D. L. Kaplan (MIT)
on 26 Jul 2008; 6:01 UT
Password Certification: Manuel Torres (

Subjects: Infra-Red, Binaries, Black Holes, Neutron Stars, Transients

We present infrared observations of the counterparts to the X-ray transients SLX 1746-331 and XTE J1810-189 obtained with the 6.5m Magellan Baade telescope at Las Campanas Observatory. Both sources were re-observed with the PANIC camera in order to confirm the candidate counterparts proposed in ATels #1252 and #1508.

SLX 1746-331.- The black hole X-ray transient SLX 1746-331 (ATels #143, #1235, ##1237) was observed on 2008 Jun 21 07:26 - 07:45 UT. A series of 15s Ks-band images totaling 675s on source were acquired under good sky conditions with a mean seeing of 0.6 arcsec. PSF-fitting photometry shows that the counterpart candidate has further faded from Ks=17.29 +/- 0.08 (ATel #1252) to Ks = 18.3 +/- 0.2.

XTE J1810-189.- The neutron star X-ray transient XTE J1810-189 (ATel #1424, #1443, #1490) was observed on 2008 Jun 23 05:38 - 06:05 UT. Series of 15s Ks-band images totaling 900s on source were obtained under a seeing of 0.5 arcsec. PSF-fitting photometry reveals that the brightest object within the Chandra error circle has declined from Ks=17.3 +/- 0.2 (ATel #1508) to Ks = 18.0 +/- 0.1.

The additional fading of these infrared sources firmly establish them as counterparts to SLX 1746-331 and XTEJ1810-189.

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R. E. Rutledge , Editor
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