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 (email@example.com)
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
We encourage follow up observations at various wavelengths.