MAGIC detection of very high energy gamma-ray emission from the
  low-luminosity blazar 1ES 1741+196
  We present the first detection of the nearby (z=0.084) low-luminosity BL Lac
object 1ES 1741+196 in the very high energy (VHE: E$>$100 GeV) band. This
object lies in a triplet of interacting galaxies. Early predictions had
suggested 1ES 1741+196 to be, along with several other high-frequency BL Lac
sources, within the reach of MAGIC detectability. Its detection by MAGIC, later
confirmed by VERITAS, helps to expand the small population of known TeV BL
Lacs. The source was observed with the MAGIC telescopes between 2010 April and
2011 May, collecting 46 h of good quality data. These observations led to the
detection of the source at 6.0 $\sigma$ confidence level, with a steady flux
$\mathrm{F}(> 100 {\rm GeV}) = (6.4 \pm 1.7_{\mathrm{stat}}\pm
2.6_{\mathrm{syst}}) \cdot 10^{-12}$ ph cm$^{-2}$ s$^{-1}$ and a differential
spectral photon index $\Gamma = 2.4 \pm 0.2_{\mathrm{stat}} \pm
0.2_{\mathrm{syst}}$ in the range of $\sim$80 GeV - 3 TeV. To study the
broad-band spectral energy distribution (SED) simultaneous with MAGIC
observations, we use KVA, Swift/UVOT and XRT, and Fermi/LAT data. One-zone
synchrotron-self-Compton (SSC) modeling of the SED of 1ES 1741+196 suggests
values for the SSC parameters that are quite common among known TeV BL Lacs
except for a relatively low Doppler factor and slope of electron energy
distribution. A thermal feature seen in the SED is well matched by a giant
elliptical's template. This appears to be the signature of thermal emission
from the host galaxy, which is clearly resolved in optical observations.
