LMXB

Alert Notice 592: V404 Cyg observations needed tonight for Chandra observations

August 11, 2017

Dr. Gregory Sivakoff (University of Alberta) and colleagues have requested AAVSO observers' assistance in observing the black hole X-ray transient LMXB V404 Cyg in support of Chandra observations taking place TONIGHT. The Chandra schedule is

2017 Aug 11 23:49:04.072  - 2017 Aug 12 13:42:14.730 UTC

Alert Notice 520: X-ray nova and LMXB V404 Cyg in rare outburst

Campaign extended until further notice: As V404 Cyg's behavior following outbursts is clearly unpredictable, AAVSO observers are asked to continue obtaining multicolor photometry as well as visual observations. - April 2017

June 18, 2015: V404 Cyg, an X-ray nova and a low mass X-ray binary (LMXB) with black hole component, is undergoing its first reported X-ray and optical outburst since 1989. Large scale, rapid variations are being reported in wavelengths from X-ray to radio by professional and amateur astronomers worldwide.

Alert Notice 324: 1614-15 V818 Sco - Request for observations to support Spitzer observations

August 17, 2005: Our assistance has been requested by Dr. Stefanie Wachter, Spitzer Science Center, Caltech, in observing the low-mass x-ray binary V818 Sco (Sco X-1) in support of her upcoming Spitzer observations of this object.