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UVOT Grism Limits

The image above shows the upper flux limits for which the grisms are useful

Poole et al. (2008) provide the conversion factors between count rate and fluxes, as well as the zero-point magnitudes. Using C = 10[(ZPT-m)/2.5], where C = count rate, ZPT = zero-point value and m = magnitude, the above plot can be used to estimate the magnitudes at which the grisms are useful. This method shows that magnitude 9-10 is the brightest useful source for the UV grism (about magnitude 11-12 for the V grism).

The grism can be useful for sources with UV fluxes as low as ~10-15 erg cm-2 s-1 A-1 (around magnitude 16).