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GREAT Early Results

GREAT Early Results. G öran Sandell, on behalf of the GREAT Consortium. GREAT installed on SOFIA. SHORT SCIENCE 2 (SS2). 3 flights in early April + one setup flight (OCF4) GREAT SS2 configuration: L#1 1.27 – 1.39 THz (a), 1.43 – 1.52 THz ( b ) L#2 1.82 – 1.92 THz

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GREAT Early Results

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  1. GREAT Early Results Göran Sandell, on behalf of the GREAT Consortium

  2. GREAT installed on SOFIA

  3. SHORT SCIENCE 2 (SS2) • 3 flights in early April + one setup flight (OCF4) • GREAT SS2 configuration: • L#1 1.27 – 1.39 THz (a), 1.43 – 1.52 THz (b) • L#2 1.82 – 1.92 THz • Improved Bandwidth – now 1.5 GHz • Better noise temperature

  4. Noise performance & bandwidth • SSB-noise performance vs. LO frequency • gaps are due to LO power limitations • lower performance between 1840 and 1885 GHz is due to LO noise contributions • clean overall band-pass (right hand side) • usable bandwidth up to 1.5GHz

  5. Performance Summary

  6. GREAT Short Science • oneobservatorycharacterizationflight hardware & procedures (preparedduringlineops & in HIL/SIL) worked fine, butoperationtroubledbyserioussoftwareissues finally, on Saturn & galacticPDRs, wedetermined & verified: • boresightoffsets GREAT to FPI • Z-focusoffset GREAT to FPI • GREAT observingmodes • pointed, raster, on-the-fly, in total power and choppedobservingmodes • in both, continuum and spectrospopymodes message: a single commissioning flight for an instrument with the complexity of GREAT (blind from ground) is sub-critical. • threeshortscienceflights

  7. GREAT Short Science sciencedemonstration was amazinglysuccessful • duringourthree SS2 flights • 7-8 scienceprojectscompleted (to theextentpossible) • 2-3 projects do needmoreintegration time, will bere-scheduled in July • science will bepublished in A&A specialvolume in autumn, withtechnicalcontributionsdesribing GREAT • status of dataprocessing • calibrationpipeline (atmosphericmodels) moredemandingthanexpected [lack of calibratedwaterreadingsfromonboardmonitorpainful] • improving on shortcomings (headerinformation, timing)

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