Table 5: Spectral analysis of GRB 060904B. We indicate only the best fit models ( top panel, a cut-off power law; bottom panel, a Band model). Column Bin refers to the TAROT measurements defined in Sect. 3.1 and reported in Fig. 5. Bins 1, 4, and 5 are XRT data only, while bins 2 and 3 are XRT and BAT data fit together. Values between parentheses are set to the value indicated. Extragalactic absorption is computed in the GRB rest frame. The two spectral indexes of the Band function are given as low energy spectral index first, high energy spectral index after. Several values are not constrained by the fit (the E0 values for bins 1 and 5 with a cut-off power law). All errors are given at the 90% confidence level. When applicable, upper limits are given at the 95% confidence level.

Epoch		 Bin Spectral E0 Extragalactic $\chi^2_\nu$ d.o.f.
(seconds   index (keV) absorption    
since trigger)       (1022 cm-2)    

90.8-120.8		 1 $1.3 \pm 0.8$ - (0.78) 0.92 1
127.2-156.6 2 $0.3 \pm 0.2$ 37.9+36.6-14.5 $0.8 \pm 0.5$ 1.08 28
163.2-193.8 3 $0.8 \pm 0.2$ 13.2+7.0-4.1 $0.8 \pm 0.2$ 1.18 119
199.8-229.8 4 $1.2 \pm 0.5$ 6.8+13.4-3.8 $0.6 \pm 0.2$ 0.93 61
237.0-267.0 5 $2.5 \pm 0.3$ - $0.8 \pm 0.2$ 1.09 42

127.2-156.6		   $0.3 \pm 0.2$ 39.6+35.7-15.4 $0.8 \pm 0.5$ 1.12 27
    >6.84        

163.2-193.8		   $0.6 \pm 0.4$ 5.7+4.2-2.9 $0.7 \pm 0.2$ 1.05 118
    $1.8 \pm 0.3$        

199.8-229.8		   $1.3 \pm 0.5$ 7.4+4.1-3.9 $0.6 \pm 0.1$ 0.95 60
    -        
237.0-267.0   - <3.59 $0.7 \pm 0.2$ 1.11 41
    $2.4 \pm 0.2$        


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