XTE J1859+266 Brightens to 1.4 Crab
ATel #47; D. A. Smith (MIT)
on 16 Oct 1999; 19:42 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Donald A. Smith (dasmith@space.mit.edu)
Subjects: X-ray, Black Hole, Transient
Six 90-s observations of XTE J1859+226 (IAUC # 7274 ) with the RXTE/ASM
around 1999 Oct 16.50 (UT) show a mean intensity of 1.37+-0.04 Crab
(2-12 keV). The most recent cluster of observations prior to this
outburst measured an intensity of 870+-30 mCrab at 1999 Oct 16.115.
This value is consistent with the generally linear rise this source
has shown since its initial emergence around 1999 Oct 8.7, but the
most recent points show a clear excess above the extrapolation of the
trend. The ASM hardness ratios do not indicate any significant
spectral change during today's outburst.
Recent Light Curve and Hardness Ratio plot
