  The Spectrum-Roentgen-Gamma (SRG) observatory is currently conducting its
4-year all-sky X-ray survey, started on December 12, 2019. The survey is
periodically interrupted for technological operations with the spacecraft.
These time intervals are usually used by the Mikhail Pavlinsky ART-XC telescope
to perform calibrations. In this context, SRG carried out scanning observations
of the Puppis A supernova remnant (SNR) with the aim to check the imaging
performance of ART-XC and to optimize the technique of image reconstruction for
extended objects. Using the unique imaging capabilities of ART-XC and its
uniform coverage of the entire Puppis A region, we attempted to investigate the
morphology of this SNR at energies >4 keV, and to search for previously unknown
X-ray sources. Puppis A was observed in 2019-2020, conducting 1.5 x 1.5 degrees
shallow surveys with an exposure of 36 hours. Additional deep pointed
observations of the central part of Puppis A were carried out in 2021 lasted 31
hours to highlight the morphology of the extended emission. The X-ray emission
of the Puppis A was significantly detected as an extended structure in the 4-6
keV energy band. The morphology of the emission is in general agreement with
that observed in soft X-rays previously. The deep sky image of Puppis A
obtained with the ART-XC telescope is characterized by a typical SNR shell rim
morphology, an extended emission and a bright emission knot in the
north-eastern part of the supernova shell. Also, four point X-ray sources have
been detected, including three objects identified in catalogs, and one newly
discovered X-ray emitter.
