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New X-ray outburst of XTE J1550-564

ATel #134; Erik Kuulkers (ESA/ESTEC), Ron Remillard (MIT), Jon M. Miller (CfA)
on 31 Mar 2003; 14:11 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Erik Kuulkers (E.KUulkers@sron.nl)

Subjects: X-ray, Request for Observations, Binary, Black Hole, Transient

E. Kuulkers (ESA/ESTEC), R. Remillard (MIT), and J.M. Miller (CfA), report that the renewed activity of XTE J1550-564 (IAUC # 8100 , CBET #12) is now also seen in the RXTE/ASM. The source started to appear around March 29. Between March 29 and 31 the 2-12 keV flux was between 40 and 65 mCrab, with a mean of 55+/-3 mCrab. The spectrum above ~5 keV is significantly harder than the Crab, consistent with the strong detection at hard X-rays with Integral (cf. IAUC # 8100 ). Since such an early start of a black-hole X-ray transient has been rarely observed, we strongly encourage observations at various wavelengths.