On November 13th 06:35 UT, Emmanuel Jehin from the Trappist telescope in Chile reported that the water production rate had increased by a factor of x2 in 24 hours. The value they were measuring was 2.0x10^28 molecules/s at 10.000 km. They suspected that an outburst was going on.

On November 13th, 06:51 UT Francois Kugel of the French group of observers, reported that they were seeing a magnitude increase of 1 magnitude in 24 hours.

(3) On November 14th, 01:42 UT, Nicolas Biver reports that comet ISON was visible to the naked eye. He measured magnitudes 8.1 on Nov. 12.2, 7.4 on Nov. 13.22, and 6.4 on Nov. 14.2.

Additional datasets are being reduced and we will show the results soon. A possible interpretation of these plots is that fragmentation has begun, and the larger exposed area is producing the outburst. We still lack visual evidence to confirm if the nucleus is intact or has begun its fragmentation. The outburst began at -0.66 AU from the Sun pre-perihelion, practically identically to the disintegration distance of comet Bressi.