Swift follow-up of the new integral source IGRJ16442-554
ATel #2188; E. Bozzo (ISDC), C. Ferrigno (ISDC/IAAT), A. Manousakis (ISDC), M. Del Santo (INAF/IASF-Roma)
on 3 Sep 2009; 15:41 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nami Mowlavi (Nami.Mowlavi@obs.unige.ch)
Subjects: X-ray, Gamma Ray, Transient
After the discovery of the new INTEGRAL source IGRJ16442-554 (Atel #2185), a Swift follow-up
Swift/XRT observed IGRJ16442-554 on 2009-09-02 at 14:09:58 UT, for a total exposure time
of 5 ks. Only one source was detected within the INTEGRAL/ISGRI error box.
The refined source position is:
RA: 16 44 38.15 DEC: -55 50 45.93 (J2000)
with an estimated error of 4.1 arcsec (90% c.l.).
The source count rate was relatively low, 2.7E-02 +/- 3.0E-3 cts/sec, and only
a rough characterization of the spectrum could be obtained (we used the C-statistics).
The Swift/XRT spectrum could be fit either by a power-law
(photon index 1.9 +/- 0.9) or with a simple blackbody (kT=0.5 +/- 0.1 keV).
In both cases the absorption column density turned out to be consistent with zero.
The 0.5-10 keV flux was 1.1E-12 ergs/cm2/s, i.e.
a factor ~50 lower than the flux determined by ISGRI in the 20-100 keV energy band.
No significant variability was observed in the Swift/XRT light curve.
Inside the Swift/XRT error box we found one 2MASS source, 2MASS 16443770-5550454
(J=10.953+/-0.033, H=10.341+/-0.031, K=10.175+/-0.027), and one USNO B1 source,
USNOB1 0341-0647474 (B2=12.95 R2=11.78, I=11.00).
The positions of these two sources are coincident within ~1 arcsec.
Further analysis are ongoing. We encourage multi-wavelength observations.