RXTE PCA Observations of XTE J1118+480
ATel #390; Jean Swank (GSFC), Craig Markwardt (GSFC/UMD)
on 14 Jan 2005; 23:50 UT
Credential Certification: Jean Swank (swank@milkyway.gsfc.nasa.gov)
Subjects: X-ray, Binary, Black Hole, Transient
Referred to by ATel #: 420
RXTE had pointed observations of XTE J1118+480 for 660 and 960
seconds, respectively, on Jan. 13, 2005 at 6:31 UT and Jan 14, 3:17
UT. The average spectra were well fit with a power law of photon index
1.8 and an iron line with 42 eV equivalent width. The fluxes were
equivalent to 20 and 21 mCrab 2-10 keV. With as much flux again above
10 keV, the X-ray luminosity above 2.5 keV is 3.7E35 ergs/s. The power
density spectra indicate variability below 0.1 Hz of 25-30%, with
possible quasiperiodic oscillations near 0.02 Hz. These observations, in which the
spectrum is very similar to that observed in 2000, are much earlier in
the outburst. Further observations are planned.
