... eruption

Appendix A is only available in electronic form at http://www.edpsciences.org

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... spectrum

The difference in the blackbody temperature between Lynch et al. (2004) and the present study (2700 K versus $\sim$5000 K) is simply due to the interstellar reddenning correction, i.e. no reddenning correction in Lynch et al, versus E_B-V = 0.9 in the present study. Indeed, if we apply our fitting procedure with E_B-V = 0.0 to the ${\it JHKLM}$ magnitudes of Lynch et al. in January 2002, the resultant temperature is $\sim$2700 K.

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