Re: [AAVSO-DIS] XTE J1550-564 - Brightening x-ray transient > Brightening X-Ray Transient > > Those of you with 'large-biceped' scopes may wish to monitor this > object...I forward the following. If you wish to participate in the > discovery of new and unusual stars, and have the (dark-sky) site and > equipment capability to capture targets in the 14 and 15 mag range (or > dimmer!), review this site for further information. Good hunting... I am the original sender; the message was intended for the high-energy astronomy-sensitive VSNET community rather than CBA, but it won't matter much. We would love to hear from anyone the result of observations, share all available information. Blackhole-type X-ray transients are rather rather events, at least to visual observers. Roughly one in a fer years within amatuer's telescopes. The object is fainter in V (around mag 16), but is bright enough to IR-sensitive CCDs. I'd rather recommend the following URLs, among which the GRO J0422+32 (V518 Per) page is comprehensive in terms of time-resolved photometry and detection of periodic modulations. http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/j0422.html http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/cicam.html (CI Cam) Some recent X-ray transients, but faint: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/groj1655.html http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/grs1739.html http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/j0422-9703.html http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/xtej1709.html http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/xtej1755.html http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/xtej2123.html Regards, Taichi Kato