March 21, 2018: Dr. Tom Maccarone (Texas Tech University) has requested AAVSO observers' assistance in monitoring the outbursting black hole X-ray binary ASASSN-18ey = MAXI J1820+070 in support of VLT and XMM observations scheduled for:
2018 22 March 08-09:30 UT and 29 March 08-09:30 UT
V time series are requested, with as short a cadence as possible (ideally, a time resolution of 0.1 second or better).
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
April 28, 2017: Dr. Gregory Sivakoff (University of Alberta) has requested AAVSO observers' assistance in monitoring Swift J1357.2-0933 (CRTS J135716.8-093238) during its current outburst.
July 1, 2015: In AAVSO Alert Notice 522 on the upcoming observations of the black hole X-ray binary V404 Cyg by HST, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT (Barthelmy et al., GCN Circular 17929). The correct date is 2015 June 15.77197 UT.
Correction: In the text below, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT. The correct date is 2015 June 15.77197 UT.
September 10, 2011: Dr. Gregory Sivakoff (U. of Alberta) requests observations of the X-ray binary star MAXI J1836-194 as part of the JACPOT collaboration studying stellar radio jets from compact binaries. There is no predetermined duration for this campaign, but observations are requested now to coincide with ongoing X-ray and radio observations.
