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ATEL # 1387; F. Capitanio, M. Del Santo & A. Bazzano (INAF/IASF-Roma)
on 13 Feb 2008; 18:17 UT
Password Certification: Melania Del Santo (firstname.lastname@example.org)
Subjects: X-ray, Binaries, Black Holes, Transients
In order to follow the latest outburst (Atel #1348,#1349,#1352) of the Galactic black hole H1743-322 during its decreasing phase, we asked for a ToO monitoring campaign with Swift/XRT. The first observation lasting 2ks has been performed on 2008, February 12th at 01:31:00 UT. The source has been detected with a 0.1-10 keV count rate of 1.95+/-0.04 counts/s. The best fit is given by an absorbed power law model with a photon index of 1.8+/-0.2 and a column density of 2.4+/-0.3 cm-2. The power law slope, consistent with the value found by INTEGRAL (Atel #1385) in soft gamma-ray, indicates that the source is still in hard state (Atel #1378). We estimated an unabsorbed 2-10 keV flux of (1.8+/-0.1)E-10 erg/cm2/s which translates in about 9 mCrab according with the JEM-X upper limit (Atel #1385). We will continue to monitor the source flux in the next weeks with Swift/XRT. We would like to thank N. Gehrels and the whole Swift Team for making these observations possible.