A new hard X-ray source discovered by INTEGRAL: IGR J16442-554
ATel #2185; E. Bozzo (ISDC), C. Ferrigno (IAAT/ISDC), J. Chenevez (DTU-NSI), M. Del Santo,Â A. De Rosa, M. Fiocchi, A. Tarana, P. Ubertini (INAF/IASF-Roma), S. Corbel, D. Goetz, L. Prat, J.-A. Zurita-Heras (CEA-Saclay), M. Renaud (APC/Univ-Paris7), S. Mereghetti, A. Paizis, L. Sidoli (INAF/IASF-Mi), P. R. den Hartog (HEPL/KIPAC/Stanford), L. Kuiper (SRON), I. Negueruela (Universidad de Alicante), S. Piraino (IASF-Pa-INAF), Georg Weidenspointner (MPI), K. Watanabe (FGCU)
on 2 Sep 2009; 17:27 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)
Subjects: X-ray, Gamma Ray, Transient
Referred to by ATel #: 2188
During a key program observation of the inner Galactic disc
performed between 2009-08-30 14:04 and 2009-09-01 12:03 (UTC), a new
source was discovered in the INTEGRAL/IBIS mosaic image.
The best localization is RA: 251.088 DEC: -55.808, with a 90% error radius
of 3.6 arcmin.
The source, IGR J16442-5548, is detected with a significance of 7 sigma
in the 20-40 keV energy band and of 5 sigma in the 40-100 keV energy band.
The corresponding flux is about 7 mCrab. The source is
not detected in the JEM-X monitor: upper limits at 3 sigma c.l. are respectively
2 and 5 mCrab in the 3-10 keV and 10-25 keV energy bands.
The IBIS/ISGRI spectrum in the 20-100 keV energy range is well described
by a power-law with photon index 2.2+/-0.5. The 20-100 keV flux is 1.2e-10 erg/cm^2/s.
The light curve exhibits pronounced variability on a few hours time scale.
We did not find any previously known X-ray source in the Simbad database
within the INTEGRAL error box. A Swift follow-up is ongoing and
multi-wavelength observations are encouraged.