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IGR J18539+0727

ATel #151; A. Lutovinov (IKI, Moscow), J. Rodriguez (CEA, Saclay), N. Produit (ISDC), N. Lund (DSRI, Copenhagen), W. Hermsen (SRON, Utrecht), R. Much (ESA/ESTEC)
on 21 Apr 2003; 12:34 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

Referred to by ATel #: 158

We report the discovery with the IBIS/ISGRI detector onboard the INTEGRAL observatory of a new transient source IGR J18539+0727. The source was detected during a routine scan of the Galactic Plane and deep observations of GRS1915+105 field on April 17-18. Its position is RA=18h53.9m and DEC=+7o27m (equinox 2000, position uncertainty ~3'). It seems that the source has a rather hard spectrum and its detected flux is ~20 mCrab in both, 15-40 keV and 40-100 keV energy bands.

The source did not appear in either of the energy bands in observations on the same field on April 1, with upper limits ~5 mCrab.

We encourage follow up observations at various wavelengths.