Likely New Outburst from XTE J1550-564
ATel #58; D. A. Smith, A. M. Levine, R. Remillard, and D. Fox (MIT), and R. Schaefer (NASA/GSFC)
on 10 Apr 2000; 16:30 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Donald A. Smith (dasmith@space.mit.edu)
Subjects: X-ray, Request for Observations, Binary, Black Hole, Transient
Observations over 2000 April 6-10 with the RXTE All-Sky Monitor show a
clear detection of a source with maximum likelihood position 1 +- 3
arcmin from the position of XTE J1550-564 (IAUC # 7009 ). It is
therefore highly likely that we have detected renewed activity of XTE
J1550-564. A 2-12 keV light curve from this location shows an
approximately linear flux increase at a rate of ~15+-2 mCrab/day,
an order of magnitude slower than the rate of increase during
the onset of the XTE J1550-564 outburst in 1998 (IAUC # 7008 , ATEL #37).
Extrapolation of the current rate of increase indicates zero flux on
2000 April 2. The energy spectrum is slightly harder than that of
the Crab, and there is as yet no evidence for spectral evolution.
Multiwavelength observations are encouraged.
