Table 1: Best fit power law spectral parameters for the Swift and BeppoSAX observations of 3C 454.3. Numbers in parenthesis are statistical errors at the 90% confidence level.

Date		 Instrument $\Gamma$ $N_{\rm {H}}$ $F_{2{-}10~\rm keV}$ $F_{15{-}150~\rm keV}$ $\chi^2_{\rm r}$/d.o.f.
      cm-2 erg cm-2 s-1 erg cm-2 s-1  
      (1021) (10-11) (10-10)  
24 April 2005 Swift XRT 1.76 (0.07) 2.3 (0.4) $6.1\pm 0.3$   0.99/201
11 May 2005* Swift XRT 1.62 (0.08) 2.3 (0.4) $16 \pm 1.0$   0.87/172
17 May 2005 Swift XRT 1.79 (0.10) 2.3 (0.6) $8.5 \pm 0.5$   0.92/108
19 May 2005 Swift XRT 1.71 (0.09) 2.4 (0.6) $10 \pm 1.0 $   0.83/122
8 May 2005 Swift BAT 1.7 (0.2) -   5.9 $\pm$ 1.0 0.68/57
11 May 2005 Swift BAT - -   5.4 $\pm$ 1.3  
17 May 2005 Swift BAT - -   <2.3  
19 May 2005 Swift BAT - -   3.3 $\pm$ 0.6  
6 August 2005 Swift BAT 1.8 (0.2) -   1.7 $\pm$ 0.3 1.47/57
5 June 2000 BeppoSAX-LECS+MECS 1.38 (0.06) 2.4(0.8) $1.1\pm 0.1$   1.12/58
* Windowed timing data.


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