The Oriented Scintillation Spectrometer Experiment (OSSE) on the COMPTON Gamma Ray Observatory has undertaken comprehensive observations of many galactic sources since launch in April 1991. These include investigations of binary X-ray sources, pulsars, several transient X-ray sources observed as Targets-ofOpportunity, and Nova Cygni 1992. Multiple observations of the galactic center region were...

The observation of a bright X-ray source by the Chandra X-ray Observatory's High Energy Transmission Grating Spectrometer (HETGS) can be compromised by photon pile-up in the CCD leading to false absorption features in the observed spectrum. A method for removing the e ects of pile-up in a dispersed grating spectrum is presented. The e ectiveness of the technique is demonstrated through its appl...