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Swift XRT position for XTE J1739-285

ATel #602; M. A.P. Torres, D. Steeghs (CfA), R. Greimel (ING), T. Augusteijn (NOT)
on 3 Sep 2005; 14:09 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Danny Steeghs (dsteeghs@cfa.harvard.edu)

Subjects: Optical, X-ray, Binary, Black Hole, Neutron Star, Transient

Referred to by ATel #: 604, 615, 777, 784

Following the recent report of renewed activity in the X-ray transient XTE J1739-285 (ATEL #592, IAUC 7300 ), we have obtained a Swift TOO observation of the field covering this transient on 2005 Sept 03 05:54:51-06:12:41 UT. The X-ray Telescope (XRT) observation was obtained in Photon Counting mode recording a mean event-rate of 6.4 counts/sec.

A single X-ray source was detected in the field of view of the XRT at the following position: RA(J2000): 17:39:54.2, Dec(J2000): -28:29:44 with an estimated uncertainty of 6 arcseconds. This is 1.3 arcminutes from the INTEGRAL position reported in ATEL #592.

We also acquired three 180s R-band images of the field with the 2.5m Nordic Optical Telescope at La Palma Observatory on 2005 Sep 02 20:59-21:14 UT with seeing conditions close to 0.8 arcsec. An astrometric frame was established using USNO stars. Five point sources were detected within the 6 arcsec SWIFT error circle, two of which have known 2MASS counterparts. Additional observations are planned in order to identify the optical/NIR counterpart to XTE J1739-285.