An outburst of BL Lac (13.7mag) was detected on June 8 (vsnet-campaign-blazar 204). It became very bright, reaching 12th mag on mid-July (vsnet-campaign-blazar 211). T. Balonek reported it was R=12.45mag on July 11 (vsnet-campaign-blazar 213). The brightening continued until July 14-15 when the object rapidly faded on July 14 and 15 (vsnet-campaign-blazar 215). The rapid fading stopped around 15.0 mag on early August (vsnet-campaign-blazar 220). The object was reported to be slightly bright around 14.5mag since early-November (vsnet-campaign-blazar 231).
Other related articles: vsnet-campaign-blazar 205, 206, 209, 210, 212, 214, 216, 217, 218, 219, 221, 225 233
Links:
WEBT campaign on BL Lac page:
http://www.to.astro.it/Groups/Extragal/webt/bllac_2001.html
(vsnet-campaign-blazar 211)
Web page for the BL Lac Campaign 2001 presented by M. Villata,
http://www.to.astro.it/Groups/Extragal/webt/
(vsnet-campaign-blazar 208)