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INTEGRAL High-Energy Detection of SWIFT J1753.5-0127

ATel #574; M. Cadolle Bel (APC & SAp, CEA-Saclay, France), J. Rodriguez (AIM & SAp, CEA-Saclay, France), A. Goldwurm (APC & SAp, CEA-Saclay, France), P. Goldoni (APC & SAp, CEA-Saclay, France), P. Laurent (APC & SAp, CEA-Saclay, France), P. Ubertini (IASF/CNR Roma, Italy), S. Mereghetti (IFCTR/CNR Milano, Italy)
on 11 Aug 2005; 13:57 UT
Credential Certification: Jerome Rodriguez (jrodriguez@cea.fr)

Subjects: X-ray, Gamma Ray, Binary, Black Hole, Transient

We report preliminary analysis of the first part of the INTEGRAL ToO observations of the transient SWIFT source J1753.5-0127 (ATEL # 546) from 2005-08-10 12:29:51.0 (U.T.C.) until 2005-08-12 15:31:07.0. A look at the first 50 ks of IBIS/ISGRI data gives us the following values: 230 sigma (~170 mCrab), 157 sigma (~190 mCrab) and 87 sigma (~250 mCrab) respectively in the 20-40, 40-80 and 80-200 energy bands. In the 200-500 keV energy band, the source is marginally detected in the quick look data. The spectrum seems to be harder than the Crab one, which is typical of Black Hole candidate in the Hard State (see also ATEL #550). The lightcurves show some variations between 135-180 mCrab in the 20-40 keV energy range and 170-200 mCrab in the 40-80 keV band.