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New X-ray transient IGR J1709.8-3628 discovered with INTEGRAL

ATel #444; S. A. Grebenev (IKI, Moscow), S. V. Molkov (IKI, Moscow), R. A. Sunyaev (IKI, Moscow; MPA, Garching)
on 26 Mar 2005; 17:04 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: S.A.Grebenev (sergei@hea.iki.rssi.ru)

Subjects: Radio, Optical, X-ray, Gamma Ray, Request for Observations, Transient

Referred to by ATel #: 447, 453, 476, 478, 479, 490, 1140, 2003

We report on the discovery with INTEGRAL of a probable new hard X-ray source located 9.4 arcmin off IGR J17091-3624. This source, IGR J1709.8-3628, was detected with IBIS/ISGRI on March 24.33-25.58, 2005 (UT) during deep Open Program observations of the Galactic center region. The S/N ratio at the mosaic image was 22.3 in the 18-45 keV band and 14.5 in the 45-80 keV band, the corresponding average fluxes were 28.2+/-1.4 and 38.7+/-2.8 mCrab. The source was variable reaching in a maximum the flux levels 60 and 95 mCrab in the above bands.

The best fit position, R.A.= 17h09m48s, Dec.= -36o28'12'' (equinox 2000.0, error radius 2') keeps the source firm outside the error box of IGRJ17091-3624 (R.A.=17h09m06s, Dec.=-36o24'07'', error radius 0.8', ATEL #150, see also ATEL #149, #160).

We detected no signs of the source fading during the reported period. Our observations were interrupted due to the end of revolution but INTEGRAL will continue to observe this region after recovery.

We encourage follow-up observations of this source at all wavelengths.