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The discovery of five new hard X-ray sources in the Circinus region by INTEGRAL

ATel #810; S. Keek (SRON), L. Kuiper (SRON) and W. Hermsen (SRON, Amsterdam)
on 15 May 2006; 11:51 UT
Credential Certification: Lucien Kuiper (L.M.Kuiper@sron.nl)

Subjects: X-ray, Gamma Ray, AGN, Binary, Black Hole, Cataclysmic Variable, Neutron Star, Quasar, Transient, Pulsar

Referred to by ATel #: 815, 1034

We report the discovery with INTEGRAL IBIS-ISGRI of five new hard X-ray sources in the Circinus region in an ultra-deep mosaic image (20-60 keV) targeted at radio pulsar PSR B1509-58. The observations (archival and open time) have been performed between 2003, February 28 and 2005, March 3, totalling an exposure time of about 2.5 Ms at our main target. Positional and flux information of these new INTEGRAL sources, all with a detection significance >6 sigma, is given in the table below along with the names of potential (low-energy) counterparts found within the 90% confidence-level error circles. Further X-ray and optical observations to identify these new sources are encouraged.

  
INTEGRAL Name    R.A.(2000)  Decl.(2000)  Lon.  Lat.  Pos.  Exposure  Flux (20-60 keV) Potential Counterpart
  
                                                      Error   (Ms)   (mCrab)
  

  
IGR J14003-6326  14 00 20.3  -63 26  9  310.55 -1.59  3.6'    1.9    0.97+/-0.15       1RXS J140041.2-632623
  
IGR J14298-6715  14 29 49.8  -67 15 24  312.25 -6.18  3.7'    2.0    0.98+/-0.16       1RXS J142959.9-671447
  
IGR J14331-6112  14 33  6.2  -61 12 23  314.86 -0.71  3.9'    2.2    0.82+/-0.14
  
IGR J14471-6414  14 47  5.5  -64 14 37  315.09 -4.14  4.1'    2.1    0.68+/-0.14       1RXS J144628.3-641627 *
  
IGR J15539-6142  15 53 53.9  -61 42  0  322.85 -6.11  4.0'    2.1    1.37+/-0.16       ESO 136-6 (Galaxy;Type S)
   

  
* Slightly outside 90% error circle