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ASTRI-Horn is the Cherenkov telescope developed by INAF and operating inItaly on the slopes of Etna volcano. Characterized by a dual-mirror opticalsystem and a focal plane covered by silicon photomultiplier sensors, ASTRI-Hornis a prototype of the telescopes proposed to form one of the pathfindersub-arrays of the Cherenkov Telescope Array Observatory in Chile. Theelectronics of the ASTRI-Horn telescope, optimized to detect nanosecond burstof light, is not able to directly measure any continuous or slowly varying fluxilluminating its camera. To measure the intensity of the night sky background(NSB) in the field of view of the telescope, the firmware of the ASTRI-Horncamera continuously performs the statistical analysis of its detector signalsand periodically provides in output the "variance" of each pixel, which islinearly dependent on the rate of detected photons; in this way, an indirect,but accurate measurement of the NSB flux is obtained without interference withthe normal telescope operation. In this contribution we provide an overview ofseveral calibration and monitoring tasks that can be performed in astraightforward way by the analysis of the "variance" data such as the cameraastrometry, the actual telescope orientation and the monitoring of its opticalpoint spread function.

Calibration and monitoring of the ASTRI-Horn telescope by using the night-sky background measured by the photon-statistics ("variance") method