Astrophysical: Black holes

  • Publication
    Optical re-brightening of the black hole binary XTE J1859+226
    Observations of the black hole binary XTE J1859+226 revealed an unexpected optical re-brightening. Images were taken with the Nordic Optical Telescope (NOT)...
  • Publication
    Optical re-brightening of the black hole transient XTE J1752-223
    We observed the black hole candidate XTE J1752-223 (ATel #2258) with the William Herschel Telescope (WHT) and the ACAM imager/spectrograph at the Observatorio...
  • Publication
    Optical Spectroscopy of Candidates in the LIGO/Virgo Binary Merger Error Boxes
    We performed optical spectroscopy of the candidates inside the gravitational wave errorboxes (S190408an, S190425z, S190426c, S190510g, S190728q, S190814bv). The...
  • Publication
    Optical Spectroscopy of SWIFT J1753.5-0127
    Spectra of the optical counterpart to the gamma ray source SWIFT J1753.5-0127 (ATEL #546,#547,#549,#550) were acquired on 2005 July 3th 03:52-09:48 UT with the...
  • Publication
    Optical spectroscopy of V4641 Sgr
    Optical spectra (range 600-690 nm; resolution 6000) were obtained during the current outburst of this black hole binary on July 4.65-4.75 UT with the Siding...
  • Publication
    Optical Spectroscopy of XTE J1817-330 in Outburst
    A single 30 min high-resolution spectrum of the optical counterpart to the black hole candidate XTE J1817-330 (ATEL #714, #733) was acquired with the MIKE...
  • Publication
    Optical studies of V404 Cyg, the X-ray transient GS 2023+338. IV. The rotation speed of the companion star.
    Not Available
  • Publication
    Optical variability in MAXI J1659-152
    The newly identified black hole candidate X-ray binary MAXI J1659-152 (ATel #2873, #2881, GCN #11307), originally designated GRB100925A (GCN #11296) has now...
  • Publication
    Optical/IR flux fading rapidly in GX 339-4: OIR jet quenching
    The transient black hole candidate GX 339-4 is currently softening in X-ray, making a transition out of the hard state (ATel #2545). We are monitoring the...