[vsnet-alert 4604] XTE J1550-564 brightening

[Taichi Kato <tkato>]

XTE J1550-564 brightening

   According to IAUCs 7399 and 7400, the southern black hole X-ray transient
(X-ray nova) XTE J1550-564 is brightening again.  The source has brigtened
V=19.1 on Mar. 29 to V=18.1 on Apr. 10 (R magnitudes are typically 1 mag
brighter).  The source was first observed in outburst in 1998 September
(IAUC 7008), whose optical counterpart (V=16) was immediately discovered
at 15h 50m 58s.78, -56o 28' 35".0 (J2000.0, IAUC 7009).  Among VSNET
members, Gordon Garradd observed the source for several nights.
The present renewed activity may or may not resemble "mini-outbursts"
notably observed in GRO J0422+32 (=V518 Per).  The object is well located,
and would be well observed using a small telescope with a CCD.

Regards,
Taichi Kato

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