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There is a really great page on Swift Instrument efficiencies areas, capabilities, etc. at :  http://heasarc.nasa.gov/docs/swift/proposals/swift_responses.html

The paper on the uvot calibration is here http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:0708.2259. 

== The BAT Response Curve (Efficiency or Effective Area vs. Energy) ==
 
looks like this: 
{{ :public:ubat_response.jpg?direct&500 |}}

The FWHM Spectral resolution of BAT is given here: 

^Energy (keV)^ 20 ^ 50 ^ 80^
|Resolution  | 4.5 | 5.3 | 1.9 |


" Table 2.1 describes the FWHM spectral resolution of the BAT.
This quantity was derived by fitting a Gaussian to model emission
lines of negligible intrinsic width.  The shape of the cutoff at
energies greater than 100 keV prevent a meaningful measure of the FWHM
above 80 keV using a Guassian model."



== BAT Background ==

On the HEASARC BAT info page,http://heasarc.nasa.gov/docs/swift/about_swift/bat_desc.html , it says that the BAT background is 1.0e4 cts/s, apparently (but not definitely clearly) 15-150 keV; this would give 1.9 cts/s/cm^2.  In 64 ms data, I found an average background value of 0.98 cts/s/cm^2 15-100 keV (Ch 1+2+3).


== BAT Coded Mask Imaging ==

Here is an article about tuning, or corrections to expected behavior of the BAT:  Segreto+10 A&A 510, A47 (2010)

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