For further information, please contact: Purpose of Calibration: - provide performance verification of the GBM detectors. - provide benchmark.

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Presentation transcript:

For further information, please contact: Purpose of Calibration: - provide performance verification of the GBM detectors. - provide benchmark data to compare with calculated detector response data. - provide accurate, well-characterized data for subsequent scientific analysis. The GBM-NaI(Tl) Detectors (12 x): The GBM-BGO Detectors (2 x): The calibration of the GLAST Burst Monitor NaI- and BGO-detectors by Andreas von Kienlin 1, Julia Wagner 1, Helmut Steinle 1, Narayana Bhat 2, Michael S. Briggs 2, Roland Diehl 1, Gerald J. Fishman 3, Jochen Greiner 1, R. Marc Kippen 4, Chryssa Kouveliotou 5, Giselher G. Lichti 1, Charles A. Meegan 3, William S. Paciesas 2, Robert D. Preece 2, Robert B. Wilson 2 GLAST Burst Monitor X-ray Transmission of the NaI Entrance Window: The installation of an 0.7 mm thick silicon pad between the Beryllium entrance window and the crystal was necessary so that the brittle NaI crystal is able to survive the environmental conditions during launch. This additional silicon layer caused unfortunately a degradation of the transmissivity at low energies (at 10 keV ~ 30%). [1] Max-Planck-Institut für extraterrestrische Physik (MPE); [2] University of Alabama (UAH); [3] NASA/Marshall Space-Flight Center (MSFC), [4] Los Alamos National Laboratory (LANL), [5] USRA The Calibration Setup : - allowes the acquisition of spectra at different angles of incidence. - high accuracy due to laser adjustment. List of Calibration Sources: Calibration Results: The figures below summarize the main measurements performed with the flight detectors. All detectors of the same type showed nearly the same performance and all fulfilled the specified requirements. NaI Low Energy Calibration: Performed at the BESSY synchrotron in Berlin with 4 FM-NaIs: Determination of absolute efficiency at low energies (8- 60 keV) and test of response around Iodine K-Edge Detector Magnetic Susceptibility: The effect of magnetic fields on the shielded NaI-EQM module was tested from -2 G to + 2 G in 0.5 G steps at the IABG’s MFSA facility. Result: The GBM response will not be affected by the magnetic torquers of the GLAST S/C Introduction: The next large NASA mission in the field of gamma-ray astronomy, GLAST, is scheduled for launch in September Aside from the main instrument LAT, a gamma-ray telescope for the energy range between ~20 MeV and ~300 GeV, a secondary instrument, the GLAST burst monitor (GBM), is foreseen. Its task is to increase the detection rate of gamma-ray bursts for the LAT and to extend the energy range of the main instrument to lower energies (from ~10 keV to ~30 MeV). The GBM consists of 12 thin NaI-plates, which allow the determination of the angle of incidence of the gamma radiation. These crystals are sensitive in the energy range between ~10 keV and ~1 MeV. Two additional BGO detectors, which are able to detect gamma-rays in the energy range between ~150 keV and ~30 MeV, are responsible for the overlap in energy measurement with the LAT main instrument and the NaI detectors. All flight detectors were already delivered to NASA. This poster gives an overview of the calibration measurements performed by MPE at the detector level before delivery. Typical Spectra: Background-subtracted NaI- and BGO-spectra, recorded at an angle where the detector effective area is maximal (0º).