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 produced via an FTOOL named hxdnxbgen in the HEADAS package, and provided from the data archive centers. • How well do the instrument team know the background of the PIN? It depends on the observation, but we have background systematic errors within roughly 5% in the 15-40 keV band if the data have a few x 10 ks exposure. • How well do the instrument team know the background of the GSO? It depends on the observation, but again we have background systematic errors within roughly 3% in 50-100 keV band if the data have a few x 10 ks exposure. • The background spectra seem to have huge count rates. Is there something wrong? No. The normalizations of the background spectra were multiplied by 10 for the PIN in order to reduce statistical uncertainties. Note that the GSO background data have been created with the same count rate as the real data.
