CGROTL ivo://nasa.heasarc/cgrotl NASA/GSFC HEASARC HEASARC 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Observation The Compton Gamma-Ray Observatory (CGRO) was the second of NASA's Great Observatories. It was launched on April 5, 1991, from Space Shuttle Atlantis. It operated successfully for 9 years, and then was safely de-orbited and re-entered the Earth's atmosphere on June 4, 2000. Compton had four instruments that covered an unprecedented six decades of the electromagnetic spectrum, from 30 keV to 30 GeV. In order of increasing spectral energy coverage, these instruments were the Burst And Transient Source Experiment (BATSE), the Oriented Scintillation Spectrometer Experiment (OSSE), the Imaging Compton Telescope (CompTel), and the Energetic Gamma Ray Experiment Telescope (EGRET). BATSE viewed the full sky, as a transient monitor and is thus not included in this database table of pointed telescope observations. Also, EGRET and CompTel had wide fields of view, about 30 degrees, and, as such, viewed multiple targets per X-axis pointing. OSSE could be slewed (about one axis) independently from the spacecraft, so it typically viewed 2 targets per spacecraft Z-axis orientation, or "viewing period." Viewing periods were typically two weeks long. This database table contains the CGRO observations for Cycles 1 through 9. The Cycle 1 observations for EGRET and COMPTEL were part of the All-Sky Survey with no defined targets. This database table was last updated in November 2001. The information contained therein was provided by the Compton Observatory Science Support Center (COSSC). Galactic coordinates were added to the table by the HEASARC in August 2005. Duplicate entries in the table were removed in June 2019. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/cgrotl.html Archive Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=cgrotl& GET text/xml 180 99999 true 86.76 22.09 2 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=cgrotl GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_cgrotl&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CGRO 2 Gamma-ray public cgrotl CGRO Timeline pi_lname Principal Investigator Last Name meta.id.PI char nullable prnb Proposal Number char nullable view_period Viewing Period of Observation char nullable start_date Start Date of Viewing Period mjd int nullable end_date End Date of Viewing Period mjd int nullable name Primary Target Designation meta.id;meta.main char nullable ra Primary Target Right Ascension degree pos.eq.ra;meta.main double nullable dec Primary Target Declination degree pos.eq.dec;meta.main double nullable instrument Instrument char nullable z_angle Angle between Target and Z-axis degree float nullable exposure Estimated Exposure of Target (s) s time.duration;obs.exposure int nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable lii Primary Target Galactic Longitude degree pos.galactic.lon double nullable bii Primary Target Galactic Latitude degree pos.galactic.lat double nullable cycle AO Phase/Cycle Number short nullable