(Broad-Band X-Ray Telescope) An instrument that formed part of the Astro-1 payload. Its flight gave the first opportunity for making X-ray observations over a broad energy range (0.3-12 keV) with a moderate energy resolution (typically 90 eV and 150 eV at 1 and 6 keV, respective... Found on http://www.daviddarling.info/encyclopedia/B/BBXRT.html