H1743-322 back to the quiescence
ATel #1414; F. Capitanio, M. Del Santo & A. Bazzano (INAF/IASF-Roma)
on 6 Mar 2008; 18:01 UT
Credential Certification: Melania Del Santo (email@example.com)
Subjects: X-ray, Binary, Black Hole, Transient
Referred to by ATel #: 1739
We followed the BHC H1743-322/IGR J17464-3213 (ATels #1348,#1349,#1352) with
Swift/XRT during the decreasing phase of the outburst until quiescence for a
total amount of 20 ks (in 6 pointings). The observations were performed two
times per week from 2008 February 12th at 01:31:00 UT until March 5
The source flux decreasing along the observing period occurred with a constant
spectral shape, namely an absorbed power-law. The best fit parameters of all
pointings are consistent within the errors with the first observation, i. e.
gamma=1.8 +/- 0.2 and Nh=2.4+/-0.3 cm-2 (ATel #1387).
On 2008 February 26th 01:17:50 UT (latest detection) the unabsorbed flux
between 2-10 keV (8.0E-12 erg cm-2 s-1) was two orders of magnitude
lower than in the first pointing (ATel #1387). Thereafter on March 4 13:19:18
UT the source flux was at the Swift/XRT detection limit. The 2
sigma level upper limit flux was estimated in 3.4E-14 erg cm-2 s-1 which
translates in a luminosity of about 3 E+32 erg s-1 (at 8 kpc).
We would like to thank N. Gehrels and the whole Swift Team for their support.