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Discovery of a new X-ray transient IGR J16283-4838 with INTEGRAL

ATel #456; S. Soldi (ISDC, Geneva), S. Brandt (DSRI, Copenhagen), A. Domingo Garau (LAEFF, Vilspa), S. A. Grebenev (IKI, Moscow), E. Kuulkers (ESA/ESAC, Spain), G. G.C. Palumbo (Bologna University), A. Tarana (IASF/Rome-INAF)
on 11 Apr 2005; 15:16 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

Subjects: X-ray, Request for Observations

Referred to by ATel #: 458, 459, 460, 465, 478

We report the discovery of a new source by the IBIS/ISGRI detector on board INTEGRAL. The new source, IGR J16283-4838, was detected during a core program observation of the Norma Arm between 2005 April 7 13:56:50 U.T. and April 9 04:44:23 U.T., with a flux of ~3.6 mCrab in the 20-60 keV band and a significance of 6.2 in a mosaic image of 126 ksec. The source was not detected in the 60-200 keV band. This is the first time that an INTEGRAL detection of this source is reported. An analysis of the ISGRI mosaic image of the previous observation of the same region, between 2005 April 4 01:55:25 and 2005 April 6 11:23:50, reveals a 4 sigma upper limit at ~1.7 mCrab, indicating that the source is rising in a timescale of days. Its position is RA=16:28.3, DEC=-48:38, with a 3' accuracy.