Table 2
Spectral parameters and fluxes of the Swift data in the three epochs.
| Quantity | 21–23 Oct. 2006 | 29 Jan. 2008 | 4 Feb. 2008 | Units |
| 54029.04–54031.04 | 54494.23 | 54500.21 | MJD | |
|
|
||||
| Single power-law fit, XRT data | ||||
| Γ | 2.30 ± 0.08 | 2.33 ± 0.08 | 2.18 ± 0.07 | |
| F 2−10keV | 8.41 ± 0.70 | 8.92 ± 0.70 | 10.3 ± 0.7 | 10-12 erg cm-2 s-1 |
|
1.06/42 | 1.00/22 | 0.80/43 | |
|
|
||||
| UVOT filters, observed magnitudesa | ||||
| V | 16.56 ± 0.03 | – | – | |
| B | 16.97 ± 0.03 | – | – | |
| U | 16.06 ± 0.03 | – | 16.51 ± 0.03 | |
| UVM2 | – | 16.56 ± 0.03 | – | |
|
|
||||
| Log-parabolab fit, combined UVOT + XRT data | ||||
| UVOT filters | B,U | UVM2 | U | |
| Γ1 keV | 2.28 ± 0.07 | 2.29 ± 0.08 | 2.16 ± 0.06 | |
| b | 0.12 ± 0.03 | 0.17 ± 0.03 | 0.10 ± 0.03 | curvature |
|
0.071 ± 0.007 | 0.13 ± 0.02 | 0.17 ± 0.06 | keV |
| F 2−10 keV | 7.83 ± 0.70 | 8.39 ± 0.70 | 9.96 ± 0.70 | 10-12 erg cm-2 s-1 |
|
|
1.01/43 | 0.84/23 | 0.79/44 | |
Notes. Errors are reported at 90% confidence level for 1 parameter (Δχ2 = 2.71).
Value of the peak energy in the SED, obtained by fitting the same data with a different parameterization of the log-parabolic model, for which the free parameters are Epeak and b (details in Tramacere et al. 2007).
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