A Swift/XRT follow-up observation of the INTEGRAL source IGR J18325-0756
ATel #1423; R. Landi, N. Masetti, V. Sguera (INAF/IASF Bologna), A. Bazzano, M. Fiocchi (IASF/INAF Rome), A. J. Bird, A. J. Dean (Univ. Southampton)
on 14 Mar 2008; 15:38 UT
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)
Subjects: X-ray, Gamma Ray, Request for Observations
We report on the X-ray follow-up observation performed with Swift/XRT of the still unidentified INTEGRAL
source IGR J18325-0756, first announced by Lutovinov et al. 2003 (Atel #154). The source is also listed in
the catalogues of Bird et al. (2007, ApJS, 170, 175) and Krivonos et al. (2007,A&A, 475, 775). At energies
above 20 keV, IGR J18325-0756 is likely a transient object. The XRT telescope pointed at the source
region on 2005, November 7 for 10.5 ks. Within the IBIS error box, we find only one source detected with
a confidence level of 9 sigma and located at RA(J2000) = 18h 32m 28.30s and Dec(J2000) = -07d 56m 40.4s
(4.1 arcsec uncertainty). The XRT uncertainty contains only one object listed in the 2MASS catalogue (2MASS
J18322828-0756420) with infrared magnitudes J = 16.4, H = 15.3 and K = 14.5. The X-ray data analysis
provides a flat power law spectrum with photon index ~0.8 (absorption fixed to the Galactic value of 1.5 x
1022 cm-2) and a 2-10 keV flux of 2 x 10-12 erg cm-2
s-1. A steeper spectrum (Gamma ~1.8) can also fit the data but only with the absorption
exceeding the Galactic value (1.5 x 1023 cm-2).
