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ATel #328; A. Lutovinov (IKI, Moscow), M. Cadolle Bel (CEA, Saclay), G. Belanger (CEA, Saclay), A. Goldwurm (CEA, Saclay), C. Budtz-Jorgensen (DSRI, Copenhagen), N. Mowlavi (ISDC, Versoix), J. Paul (CEA, Saclay), A. Orr (ISOC/ESTEC, Noordwijk)
on 8 Sep 2004; 11:17 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: A.Lutovinov (aal@hea.iki.rssi.ru)

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

We report a discovery of a new transient source, IGR J17331-2406 with the IBIS telescope onboard the INTEGRAL observatory. The source position is RA=17h33m08s and DEC=-24o06m46s (equinox 2000), with uncertainty ~2', that is about 40 arcmin from the known X-ray pulsar GX1+4.

The source was detected during the observations of the Galactic Center field performed between 31 Aug. and 5 Sept. 2004, with an average flux measured during the 4-5 Sept observations of 9.1+/-0.8 mCrab in the 18-60 keV energy range. The source was also marginally detected (4 sigma) in the 60-120 keV energy band. Its spectrum in the 20-80 keV energy band can be well described by a simple powerlaw with a photon index of ~1.8. A possible outburst was observed between UT 22:45 - 23:15 on Sept. 4. During this period the source flux increased up to ~30 mCrab in the 18-60 keV energy band.

We encourage follow up observations at various wavelengths.