Abstract
We present the Chandra identification and localization of the transient X-ray source XTE J1906+090 and the discoveryofitsopticalandinfraredcounterparts.OuranalysisofarchivalChandraACIS-Iobservationsofthefield found the source approximately 8 0 away from the position determined earlier with the RXTE PCA. We have confirmed the source identification with timing analysis of the X-ray data, which detected the source spin period of 89.6 s. The best Chandra position for the source is R:A: ¼ 19 h 04 m 47: 491, decl: ¼þ 09 � 02 0 41B40. Subsequently, we performedopticalobservationsofthefieldaroundthenewlocationanddiscoveredacoincidentopticalsourcewithR-band magnitudeof18.7.AsearchintheTwoMicronAllSkySurveycatalogrevealedaninfraredpointsourcewithJ ¼ 15:2, H ¼ 14:2, and K ¼ 13:5, whose location is also coincident with our Chandra and optical positions. Our results add fresh evidence for a Be/X-ray transient nature for XTE J1906+090. Subject headingg infrared: stars — pulsars: individual (XTE J1906+090) — X-rays: binaries
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