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Three new hard X-ray sources in the Cassiopeia/Perseus region discovered by INTEGRAL

ATel #939; L. Kuiper (SRON), P. R. den Hartog (SRON) and W. Hermsen (SRON, Amsterdam)
on 8 Nov 2006; 14:53 UT
Credential Certification: Lucien Kuiper (L.M.Kuiper@sron.nl)

Subjects: X-ray, Gamma Ray, AGN, Binary, Neutron Star, Quasar

Referred to by ATel #: 941, 957, 1326, 1375

In an ultra-deep INTEGRAL exposure (4.1 Ms) on the Cassiopeia region, resulting from the combination of observations performed between December 12, 2003 and January 10, 2006 (INTEGRAL revolutions 142-396), two new hard X-ray sources have been detected: IGR J00335+6126 and IGR J00254+6822. A deep 1.9 Ms INTEGRAL mosaic centered on gamma-ray binary LS I+61 303 using observations performed between March 3, 2003 and July 4, 2006 (INTEGRAL revolutions 47 and 454) revealed the presence of a previously unknown hard X-ray source, IGR J02501+5440. Positional information and the time averaged flux in the 20-60 keV energy band of the 3 new hard X-ray sources are listed in the table below together with candidate low-energy source counterpart(s).

  
INTEGRAL Name     R.A.(2000)  Decl.(2000)  GLon.   GLat.   Pos.err  Flux (20-60 keV) Potential Counterpart(s)
(2-sigma) mCrab

IGR J00335+6126 * 00 33 35.2 61 26 52.2 120.80 -1.35 3.3' 0.56 +/- 0.09 1RXS J003357.9+612645
IGR J00254+6822 00 25 26.3 68 22 49.5 120.53 +5.63 2.4' 0.84 +/- 0.10 LEDA 136991/IRAS 00227+6805
IGR J02501+5440 02 50 11.3 54 40 40.6 139.62 -4.30 3.0' 1.17 +/- 0.27 LEDA 2797448

* IGR J00335+6126 is 26' from IGR J00370+6122 (See ATEL#281,#282)