How large is the HXD PIN & GSO fields of view (FOV)?
The field of view of the PIN diode is collimated by the passive fine collimator (FC) into 34’x34′ squares. The situation is the same for GSO in below 100 keV. The FCs become transparent in above 100 keV, where the FOV becomes 4.5 degrees x 4.5 degrees. • What is the recommended energy range to use in the PIN analysis? During the AO-1 period, the recommended range is 12 to 70 keV. Thermal noises sometimes appear in the 10-12 keV band, because of problems in the cooling system of the HXD from the initial phase. • What is the recommended energy range to use in the GSO analysis? During the AO-1 period, the recommended range is 40 to 600 keV. Note, however, that the background above 300 keV is so high that even the Crab data are not used in the analysis at >300 keV. • How do I get the background files or spectra required for HXD data analysis? During the AO-1/2 phases, the background files are available from the HXD background page at ISAS. In the longer term, the background files will be p
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- How large is the HXD PIN & GSO fields of view (FOV)?
