NASA NTRS · 19990099687
XTE J1550-564; GRB 990123
Abstract
The x-ray transient XTE Jl550-564 (IAUC 7008) was detected in Burst and Transient Source Experiment (BATSE) data beginning on Jan. 21. As of Jan. 23. the one-day averaged flux was 300 mCrab (+/- 20 percent, 20-100 keV), with a hard spectrum (power-law photon-number index -2.3 +/- 0.2). This is a reflare in hard x-rays, following the primary outburst in 1998 Sept.-Oct. (IAUC 7010). The source has been active in soft x-rays (2-12 keV) since about Dec. 18, according to observations by the Rossi X-ray Timing Explorer ASM.
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Harmon, B. A., Finger, M. H., McCollough, M. L., Zhang, S. N., Paciesas, W. S., Wilson, C. A.. 1999-01-01. XTE J1550-564; GRB 990123. https://ntrs.nasa.gov/citations/19990099687
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