Swift localization of XTE J1818-245
ATel #588; M. Still N. Gehrels (NASA/GSFC), D. Steeghs, M. A.P. Torres (CfA), O. Godet (U. Leicester), C. Brocksopp (MSSL)
on 20 Aug 2005; 17:23 UT
Credential Certification: Martin Still (Martin.Still@gsfc.nasa.gov)
Subjects: Ultra-Violet, X-ray, Black Hole, Transient
The Swift observatory pointed at the X-ray transient XTE J1818-245 on
2005-08-20 between 06:18:52-06:21:02 UT. The X-ray source discovered
by Levine et al. (ATel #578), is still bright. Despite pileup in the PC
detector mode (count rate = 72 c/s), the XRT localizes the source to
within 7" (90% containment) of RA = 18h 18m 24.8s, Dec = -24d 32' 15"
(J2000). The optical counterpart identified by Steeghs et al. (ATel
#585) lies within the XRT error circle.
A 134s UVOT observation was also performed through the UVW2 filter with
a central wavelength of 1800 Angstroms. There is no source contained
within the XRT error circle down to a 17.7 mag 5-sigma limit. UVOT
magnitudes are based on Vega.
