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IGR J16283-4838 X-ray flux is rising

ATel #458; A. Paizis (ISDC Geneva, IASF Milano), J. M. Miller (Harvard-Smithsonian CfA), S. Soldi (ISDC Geneva), N. Mowlavi (ISDC Geneva)
on 13 Apr 2005; 14:10 UT
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)

Subjects: X-ray, Transient

Referred to by ATel #: 465

Starting on April 10th, 2005, 01:25:59 UTC, INTEGRAL performed a TOO observation of GRO J1655-40 (PI Miller). The newly discovered IGR J16283-4838 (ATEL #456) has been in the partially coded field of view of ISGRI during all this observation.
IGR J16283-4838 is detected in IBIS/ISGRI with a significance of 11.6 in the 20-60 keV mosaic (96 ksec) with a flux of ~ 8.5 mCrab. This corresponds to an increase by about a factor 2 relative to the ~3.6 mCrab flux measured at the time of its first detection on 7-9 April 2005 (ATEL #456).