This is an old revision of the document!
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: ubat_response.jpg
The resolution is given here:
<table border=1 width=50% cellspacing=2 cellpadding=2 summary=“FWHM spectral resolution of the BAT.”>
<tr> <th width=10% BGCOLOR=“#99CCCC” ALIGN=“CENTER”>E = 20 keV</th> <th width=10% BGCOLOR=“#99CCCC” ALIGN=“CENTER”>E = 50 keV</th> <th width=10% BGCOLOR=“#99CCCC” ALIGN=“CENTER”>E = 80 keV</th> </tr>
<tr> <td width=10% BGCOLOR=“#FFCC33” ALIGN=“CENTER”>4.5</td> <td width=10% BGCOLOR=“#FFCC33” ALIGN=“CENTER”>5.3</td> <td width=10% BGCOLOR=“#FFCC33” ALIGN=“CENTER”>1.9</td> </tr>
</table> “ 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)
