ﬂux upper limits are generally the most-constraining
ever reported for these objects.
7. Multi-wavelength Studies of VHE
Blazars
During the ﬁrst three seasons of VERITAS obser-
vations, pre-planned extensive MWL campaigns were
organized for three blazars 1ES 2344+514 (2007-08),
1ES 1218+304 (2008-09) and 1ES 0229+200 (2009-
10 - ongoing). In addition, numerous ToO MWL-
observation campaigns were performed. These include
campaigns for every blazar/AGN discovered by VER-
ITAS, and all include Swift (XRT and UVOT) data.
All MWL campaigns on the VHE blazars discovered
eConf C091122