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X-Ray Background Tool     Calculate average X-ray background count rates from the ROSAT All-Sky Survey diffuse background maps. Object Name or Coordinates: Use semicolons to separate multiple object names or coordinate pairs (e.g., Cyg X-1 ; 101.295, -16.699 ; 6 45 10.8, -16 41 58) Name Resolver: NED only SIMBAD only GRB only GRB, NED, then SIMBAD GRB, SIMBAD, then NED Coordinate System: J2000 B1950 B1900 Galactic Ecliptic Radius: degrees Search Region:  Cone  Annulus    Inner Radius:  degrees Results Options: Integrate Count Rates Over Search Area Verbose Output Create XSPEC-compatible FITS Spectrum Plot Using XIMAGE     Scaling:  Histogram Linear Logarithmic Square-Root Overlay Contours      References: List... Software developed and maintained by Edward J. Sabol of the HEASARC. Based primarily on the research of Dr. Steve Snowden. Additional acknowledgments... HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public

Science Mission Directorate Universe Division Beyond Einstein | Origins FAQ/Comments/Feedback Education Resources Find helper applications like Adobe Acrobat A service of the Astrophysics Science Division at NASA/ GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory (SAO) HEASARC Director: Dr. Alan P. Smale HEASARC Associate Director: Dr. Roger Brissenden Responsible NASA Official: Phil Newman Web Curator: Meredith Gibb Privacy Policy and Important Notices.