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INTEGRAL detects XTE J1739-285

ATel #592; A. Bodghee, N. Mowlavi (ISDC, Geneva); E. Kuulkers (ESA/ESAC, Spain); R. Wijnands (UvA, Netherlands); S. E. Shaw (Southampton, UK / ISDC, Geneva); T. Courvoisier (ISDC, Geneva); C. Markwardt (NASA/GSFC, USA); T. Oosterbroek, A. Orr (ESA/ESTEC, Netherlands); A. Paizis (ISDC, Geneva / IASF, Milano); K. Ebisawa (NASA/GSFC, USA); P. Kretschmar (ESA/ESAC, Spain)
on 26 Aug 2005; 16:52 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

Subjects: X-ray, Transient

Referred to by ATel #: 602, 604, 615, 777, 784

The JEM-X telescope on board INTEGRAL detected the X-ray transient XTE J1739-285 while monitoring the Galactic Bulge in revolution 350.
The source was detected in three successive pointings of 30 minutes each, starting on 2005-08-25T14:40 UTC. The fluxes in the 3-10 keV band were about 120, 70 and 77 mCrabs, respectively, and about 70, 30 and 40 mCrabs in the 10-20 keV band. The source was not detected above 20 keV by the ISGRI instrument, with an upper limit of 5 mCrabs.
The source position (J2000) derived by JEM-X is R.A.=17 40.0 and Dec.=-28 30 (2' accuracy), which is within the 5' accuracy of the position derived by RXTE in 1999 (IAUC 7300 ). The spectrum can be modeled with a power law with a photon index of 2.9+/-0.1, yielding a flux of 1.8e-9 ergs/cm2/s in the 2-10 keV band. Follow-up observations at other wavelengths are encouraged.