Swift localization of the new hard X-ray transient IGR J17498-2921
ATel #3555; E. Bozzo, C. Ferrigno, (ISDC, Switzerland), A. Papitto (Univ. Cagliary, Italy), L. Gibaud (ISDC, Switzerland)
on 13 Aug 2011; 10:50 UT
Distributed as an Instant Email Notice Transients
Credential Certification: E. Bozzo (email@example.com)
Subjects: X-ray, Gamma Ray, Binary, Black Hole, Neutron Star, Transient
Referred to by ATel #: 3558, 3559, 3560, 3561, 3562, 3563, 3568, 3601, 3606, 3622, 3634, 3643, 3661
Following the discovery of the new INTEGRAL hard X-ray transient, IGR J17498-2921 (Atel #3551),
a follow-up observation of 5 ks with the narrow field instrument on-board Swift
was performed in PC mode starting from 2011-08-12 at 15:41 (UTC).
A single bright source is detected within the INTEGRAL error circle. The pile-up corrected spectrum
could be well fit with a simple absorbed power-law model. We estimated an absorption
column density of (3.0+/-0.3)E22 cm^(-2) and a photon index of 1.9+/-0.2 (in agreement with the
photon index determined from IBIS/ISGRI, Atel #3551; uncertainties are at 90% c.l.). The corresponding flux is 2e-10 ergs/cm^2/s (2-10 keV, not corrected for absorption).
We obtained a preliminary source position at:
RA = 267.4819
Dec = -29.3227
with an associated 90% c.l. uncertainty of 4 arc seconds obtained using the xrtcentroid tool.
However, due to the pile-up that affected the observation, we estimated the confinement radius
by connecting the spikes of the images. This method suggests an increased uncertainty radius
of 7 arcsec.
A more refined analysis is ongoing.
Further observations of the source with Swift are already requested.
We thank the Swift Team for the very rapid scheduling of the observation of IGRJ17498-2921