PKS 2155-304 : Sudden rapid fading in April
On April 23, this blazar suddenly, rapidly faded from 13.2mag
to 13.9mag as reported by B. Monard
(vsnet-campaign-blazar 185).
Just after it reached the bottom, the object began recovering.
The magnitude reached about 12.6mag on September
(vsnet-campaign-blazar 223).
The brightening stopped and remained around 12.5mag at least
until October
(vsnet-campaign-blazar 230).
Other related articles:
vsnet-campaign-blazar 224,
226,
229