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Very little work has been done searching for astrophysical transient opticalemission in the millisecond to nanosecond regime with significant sensitivity.We call this regime "Ultra-Fast Astronomy", or UFA. To investigate transientson as short time scales as possible, we developed our own customized readoutsystem for a silicon photomultiplier (SiPM)-based UFA camera, intended for useon conventional astronomical telescopes. SiPMs, available in array packages forimaging a field, are capable of time-tagged single-photon detection in thevisible wavelength range. Our readout system consists of 16 channels of 14-bitdata logging. Each channel includes a 50-dB gain pre-amplifier, signal shapingcircuits, an analogue front end, an analogue to digital converter, and a XilinxUltraScale+ Field Programable Gate Array Multipurpose System on Chip(FPGA-MPSoC)board for data-logging. We show that our system successfully readout the data from SiPM at 16 ns intervals with a maximum power consumption of300 mW per channel and capability to perform concurrent 16 channels readout.

A SiPM photon-counting readout system for Ultra-Fast Astronomy