Challenging gamma-ray burst models through the broadband dataset of GRB 060908

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Table 4:

Optical/NIR light curve best-fit results for models consisting of two (2PL) or three power laws (3PL).
	2PL	3PL
$\alpha_1$	$\rm 1.48_{-0.25}^{+0.24}$	$\rm 1.32_{-0.13}^{+0.19}$
$t_{{\rm b}_1}$ (s)	$\rm 138_{-43}^{+167}$	$\rm 365_{-228}^{+411}$
$\alpha_2$	$\rm 1.05_{-0.03}^{+0.03}$	$\rm0.94_{-0.36}^{+0.10}$
$t_{{\rm b}_2}$ (s)	-	$\rm 2360_{-900}^{+4300}$
$\alpha_3$	-	$\rm 1.15_{-0.06}^{+0.24}$
$\beta$	$\rm0.17_{-0.40}^{+0.34}$	$\rm0.33_{-0.29}^{+0.25}$
E_B-V (mag)	<0.10	<0.10
$\chi^2/{\rm d.o.f.}$	159.1/121 = 1.32	133.8/119 = 1.12

Notes. Spectral data are always fit with a single power-law plus possible rest-frame absorption following the SMC extinction curve and the known Galactic absorption. Upper limits are at 95% confidence level.

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