  A comprehensive study of the nucleus and western hotspot of Pictor A is
carried out using AstroSat observations, 13 years of Fermi, and archival Swift
observations, along with other published data. We report the first detection of
the western hotspot of Pictor A in the far-UV band using observations from
AstroSat-UVIT. The broad-band SED of the western hotspot is explained by a
multizone emission scenario where X-ray emission is caused by synchrotron
emission process in the substructures embedded in the diffuse region, while the
emission in radio to optical is caused by synchrotron emission process in the
diffuse region. We do not notice any excess in the IR band and an additional
zone (beyond 2-zone) is not required to account for the X-ray emission. Our
broad-band spectro-temporal study and associated modelling of the core and
hotspot of Pictor A suggests that (a) gamma-rays originate in the nuclear jet
and not from the hotspot (b) X-ray emission from the core of Pictor A has
nuclear jet-origin instead of previously reported disk-origin.
