Simulating instrumental systematics of Cosmic Microwave Background experiments with s4cmb

The observation of cosmic microwave background (CMB) anisotropies is one the key probes physical cosmology. weak nature this signal has driven construction increasingly complex and sensitive experiments observing sky at multiple frequencies with thousands polarization detectors. Given high sensitivity such experiments, instrumental systematic effects can become limiting factor towards full scientific exploitation their data. In paper we present s4cmb (Systematics for CMB), a Python package designed to simulate raw data streams in time domain modern CMB based on bolometric technology, inject these realistic systematics effects. aim help assessing contamination due real data, guide design future instruments, as well increase realism simulated sets required development accurate analysis methods.