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We present detector characterization of a state-of-the-art near-infrared(950nm - 1650 nm) Discrete Avalanche Photodiode detector (NIRDAPD) 5x5 array.We designed an experimental setup to characterize the NIRDAPD dark count rate,photon detection efficiency (PDE), and non-linearity. The NIRDAPD array wasilluminated using a 1050 nm light-emitting diode (LED) as well as 980 nm, 1310nm, and 1550 nm laser diodes. We find a dark count rate of 3.3x10$^6$ cps,saturation at 1.2x10$^8$ photons per second, a photon detection efficiency of14.8% at 1050 nm, and pulse detection at 1 GHz. We characterized this NIRDAPDarray for a future astrophysical program that will search for technosignaturesand other fast (>1 Ghz) astrophysical transients as part of the Pulsed All-skyNear-infrared Optical Search for Extraterrestrial Intelligence (PANOSETI)project. The PANOSETI program will consist of an all-sky optical (350 - 800 nm)observatory capable of observing the entire northern hemisphere instantaneouslyand a wide-field NIR (950 - 1650 nm) component capable of drift scanning theentire sky in 230 clear nights. PANOSETI aims to be the first wide-fieldfast-time response near-infrared transient search.

Detector Characterization of a Near-Infrared Discrete Avalanche Photodiode 5x5 Array for Astrophysical Observations