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Table 1:

The photometric parameters of SN 2007gr.
  U B V R I J H K
Apparent mag. 13.29 $\pm$ 0.02 13.47 $\pm$ 0.02 12.91 $\pm$ 0.01 12.76 $\pm$ 0.02 12.61 $\pm$ 0.02 12.40 $\pm$ 0.18 12.06 $\pm$ 0.10 11.66 $\pm$ 0.10
at maximum                
Absolute mag. -16.99 $\pm$ 0.19 -16.75 $\pm$ 0.19 -17.22 $\pm$ 0.18 -17.29 $\pm$ 0.18 -17.36 $\pm$ 0.17 -17.52 $\pm$ 0.20 -17.83 $\pm$ 0.20 -18.21 $\pm$ 0.20
at maximuma                
Extinction (mag) 0.44 $\pm$ 0.09 0.38 $\pm$ 0.08 0.29 $\pm$ 0.06 0.21 $\pm$ 0.04 0.13 $\pm$ 0.03 0.08 $\pm$ 0.02 0.05 $\pm$ 0.01 0.03 $\pm$ 0.01
JD of 54 334.8 $\pm$ 0.8 54 337.0 $\pm$ 1.0 54 338.5 $\pm$ 1.1 54 341.0 $\pm$ 1.7 54 341.0 $\pm$ 1.5 54 341.4 $\pm$ 2.3 54 342.4$\pm$ 4.3 54 342.3 $\pm$ 3.5
maximumb                
Epoch of -2.2 $\pm$ 1.3 0 $\pm$ 1.0 1.5 $\pm$ 1.5 4.0 $\pm$ 2.0 4.0 $\pm$ 1.8 4.4 $\pm$ 2.5 5.4 $\pm$ 4.4 5.3 $\pm$ 3.6
maximum (days)c                
Rising 9.3 $\pm$ 2.8 11.5 $\pm$ 2.7 13.0 $\pm$ 2.9 15.5 $\pm$ 3.2 15.5 $\pm$ 3.1 15.9 $\pm$ 3.0 16.9 $\pm$ 5.1 16.8 $\pm$ 4.4
times (days)d                
$\bf {Decline}$ $\bf {rates}$e                
(30-100d)c 0.0095 $\pm$ 0.0007 0.0111 $\pm$ 0.0006 0.0170 $\pm$ 0.0005 0.0194 $\pm$ 0.0007 0.0164 $\pm$ 0.0004 0.0304 $\pm$ 0.0006 0.0268 $\pm$ 0.0008 0.0342 $\pm$ 0.0008
(100-170d)c 0.0169 $\pm$ 0.0011 0.0153 $\pm$ 0.0003 0.0189 $\pm$ 0.0003 0.0128 $\pm$ 0.0004 0.0167 $\pm$ 0.0005 $\ldots$ $\ldots$ $\ldots$
(30-170d)c 0.0114 $\pm$ 0.0006 0.0130 $\pm$ 0.0004 0.0171 $\pm$ 0.0003 0.0159 $\pm$ 0.0005 0.0169 $\pm$ 0.0002 $\ldots$ $\ldots$ $\ldots$

a A distance modulus $\mu $ = 29.84 $\pm$ 0.16 mag and a colour excess E(B-V) = 0.092 mag were adopted. b The uncertainty in the epoch of maximum is defined as the time period in which the magnitude is not more than 0.01 mag fainter than the peak magnitude (Yoshii et al. 2003). c Epoch with respect to the estimated B-band maximum JD 2 454 337.0 $\pm$ 1.0. d Epoch with respect to the estimated explosion date JD 2 454 325.5 $\pm$ 2.5. e Decline rates (mag d-1) were estimated using linear least-square fitting.

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