IGR J00234+6141: A new weak hard X-ray source found by INTEGRAL
ATel #394; P. R. den Hartog (1), L. Kuiper (1), W. Hermsen (1, 2), J. Vink(1), J. J.M. in 't Zand (1, 3), R. H.D. Corbet (4), R. Remillard (5) (1 SRON Utrecht; 2 University of Amsterdam; 3 University of Utrecht; 4 NASA/GSFC and USRA; 5 MIT)
on 19 Jan 2005; 09:45 UT
Credential Certification: P.R. den Hartog (Hartog@sron.nl)
Subjects: X-ray, Gamma Ray, Binary, Neutron Star
Referred to by ATel #: 709
We report the discovery by INTEGRAL of a new hard X-ray source,
IGR J00234+6141. This source was detected accumulating data from
different observations in December 2003 and February 2004 resulting
in a 1.6-Ms exposure targeting the Cassiopeia region. The source is
weak with a flux of 1.20 +/- 0.15 mCrab and a detection significance
of 8 sigma in the energy band 20-30 keV of IBIS/ISGRI. Also in the
30-40 keV band the source is seen, at a 3.8-sigma level with flux
0.8 +/- 0.2 mCrab. Corresponding photon fluxes are
(1.35 +/- 0.17)E-5 ph/cm2/s/keV and (4.25 +/- 1.13)E-6 ph/cm2/s/keV.
The source is too weak to perform variability studies using the presently
available INTEGRAL data.
The best source postion is R.A. = 0h 23m 24s,
Decl. = +61o 41' 32" (J2000) with an estimated 3' accuracy (90% confidence
level). The position of the ROSAT X-ray source 1RXS J002258.3+614111, which is located 3.15'
from the INTEGRAL centroid, is marginally consistent with the INTEGRAL position.
A newly derived RXTE-ASM light curve shows a marginal detection of the source,
and no modulation was found.
Given its position close to the Galactic plane (b = -1 deg.), the lack
of a radio counterpart and the nature of the majority of
previously reported new INTEGRAL sources, it is likely to be an X-ray binary, rather
than a source with an extragalactic origin.