Transient Black Hole Candidate XTE J1550-564 Brightens to 6.8 Crab

Astronomy and Astrophysics – Astronomy

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X-Ray, Binaries, Transients

Scientific paper

The black hole candidate (BHC) X-ray transient XTE J1550-564 (IAUC #7008) continues to brighten in X-rays, according to RXTE All-Sky Monitor (ASM; 2-12 keV) observations, and at the time of this posting has reached 6.8 Crab (513 +/- 10 cts/sec) in its brightest 90-second ASM dwell. A total of 113 ASM dwells on the source between 7.0 Sep and 13.0 Sep 1998 (UT) show the X-ray intensity increased at an average rate of 0.23 +/-0.002 Crab/day (1 Crab=75.5 ASM c/s), up to 1.45+/-0.14 Crab, with little (<5%) variability about this linear rise.

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