We present simultaneous X-ray (RXTE) and optical (ULTRACAM) narrow-band (Bowen blend/HeII and nearby continuum) observations of Sco X-1 at 2-10 Hz time...
Estimate of the Accretion Disk Size in the Gravitationally Lensed Quasar HE 0435–1223 Using Microlensing Magnification Statistics
We present a measurement of the accretion disk size of the quadruple lensed quasar HE 0435–1223 from well-sampled 13-year COSMOGRAIL optical light curves. Using...
Events leading up to the 2015 June Outburst of V404 Cyg
On 2015 June 15 the burst alert telescope (BAT) on board Swift detected an X-ray outburst from the black hole (BH) transient V404 Cyg. We monitored V404 Cyg for...
Evidence for a black hole in the historical X-ray transient A 1524-61 (= KY TrA)
We present Very Large Telescope spectroscopy, high-resolution imaging, and time-resolved photometry of KY TrA, the optical counterpart to the X-ray binary A...
Evidence for a black hole in the X-ray transient XTE J1859+226
We present the results of time-resolved optical photometry and spectroscopy of the X-ray transient XTE J1859+226 (V406 Vul). Photometric observations taken...
Evidence for a black hole in the X‐ray transient XTE J1859+226
We present the results of time‐resolved optical photometry and spectroscopy of the X‐ray transient XTE J1859+226 (V406 Vul). Photometric observations taken...
Evidence for a compact jet dominating the broad-band spectrum of the black hole accretor XTE J1550-564
The black hole X-ray binary XTE J1550-564 was monitored extensively at X-ray, optical and infrared wavelengths throughout its outburst in 2000. We show that it...