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IGR J00291+5934, a new X-ray transient discovered with INTEGRAL

ATel #352; D. Eckert, R. Walter (ISDC, Versoix, Switzerland), P. Kretschmar (MPE, Garching, Germany), M. Mas-Hesse (LAEFF, Madrid, Spain), G. G.C Palumbo (University di Bologna, Italy), J.-P. Roques (CESR, Toulouse, France), P. Ubertini (IASF, Roma, Italy), C. Winkler (ESTEC, Noordwijk, The Netherlands)
on 3 Dec 2004; 11:01 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Roland Walter (Roland.Walter@obs.unige.ch)

Subjects: X-ray, Gamma Ray, Binary, Black Hole, Neutron Star, Transient, Pulsar

Referred to by ATel #: 353, 354, 355, 357, 360, 363, 364, 366, 1660

A new transient X-ray source was discovered with the IBIS/ISGRI and JEM-X detectors on board INTEGRAL on Dec. 2, 2004, during 3 successive pointings dedicated to the Galactic Plane Scan. The source was located with both ISGRI and JEM-X at R.A.= 00h 29.1', Dec.= +59d 34m, (equinox 2000.0) with an error radius of 1.5'. This position is about 20 arcmin off the cataclysmic variable V* V709 Cas and 0.5 degrees off 4U 0027+59. The S/N ratio was 21 in the ISGRI 20-60 keV band. The corresponding average flux is 55+/-5 mCrab. The source flux measured in each of the successive pointings remained constant within 20%. JEM-X detected the source in the 3-10 keV band during the only pointing in which the source was in its field of view, with a flux of 23+/-5 mCrab. The source will be in the field of view of INTEGRAL again on Dec. 5, 2004 for about 2 days for an open program observation. We encourage follow-up observations of this source at all wavelengths.