New INTEGRAL source IGR J11321-5311
ATel #545; R. Krivonos(IKI, MPA), S. Molkov(IKI), M. Revnivtsev(MPA, IKI), S. Grebenev(IKI), R. Sunyaev(MPA, IKI),A. Paizis(ISDC, IASF)
on 1 Jul 2005; 13:18 UT
Credential Certification: M. Revnivtsev (mikej@mpa-garching.mpg.de)
Subjects: X-ray, Gamma Ray, Request for Observations, Binary, Black Hole, Variables
The new bright transient source has been found during deep observations
of the Crux spiral Arm (PI Revnivtsev). The source was seen by IBIS/ISGRI detector
aboard INTEGRAL above the background at level of ~10 standard
deviations (17-60 keV) starting at 21:00 till 23:27 June 27. The source
position was determined by IBIS/ISGRI: R.A.= 11h 32.1', Dec.= -53d 11m,
(equinox 2000.0) with an error radius of 2.0'. The transient demonstrated very
hard spectrum with fluxes ~30 mCrab and ~90 mCrab in 17-60 and 60-200 keV energy bands
correspondingly, that may indicate that the source is a black hole binary.
After approximately 2-3 hours of activity the source diminished its flux
below ~3 mCrab in 17-60 keV energy band.
We encourage follow-up observations of this source at all
wavelengths.
