The real time analysis reconstruction framework of the Cherenkov Telescope Array Observatory

Abstract

In this contribution, we present the current status and recent advances in the Real-Time Analysis (RTA) framework being developed for the Cherenkov Telescope Array Observatory (CTAO). Rapidly variable and short-lived gamma ray phenomena, such as gamma ray bursts and flaring active galactic nuclei, require low-latency reconstruction and characterization to trigger prompt follow-up observations and to enable efficient coordination with other facilities. The CTAO RTA reconstruction pipeline is therefore designed to enable fast, reliable transient detection by providing event reconstruction and background rejection, while operating under stringent latency and reliability constraints imposed by time-critical science. The first Large-Sized Telescope, LST-1, located on La Palma (Canary Islands), is being used as a test bench and pathfinder for this effort. We show how experience gained with LST-1 is driving the optimization of real-time algorithms and guiding their integration into the Array Control and Data Acquisition System (ACADA) of CTAO in the Science Alert Generation (SAG) framework. In particular, we discuss the ongoing work to extend the current mono-telescope pipeline toward stereo operation with multiple telescopes, a crucial step to fully exploit the sensitivity and rapid response of the CTAO array for the study of the dynamic universe.