Targeted Search for Fast Radio Bursts with Nanshan 26 m Radio Telescope

Abstract

Fast radio bursts (FRBs) are radio transients of short duration and bright, with their physical mechanism not being fully understood. We conducted the targeted search for bursts from FRB 20201124A between June 2 and July 20, 2021. High time-resolution data were collected for 104.5 hr using the ROACH2-based digital backend. We introduce the details of our FRB search pipeline which is based on HEIMDALL and FETCH. Testing of the injected mock FRBs search could help us better understand the performance of the pipelines, and improve the search algorithms and classifiers. To study the efficiency of our pipeline, 5000 mock FRBs were injected into the data and searched using the pipeline. The results of the mock FRBs search show that our pipeline can recover almost all (≳ 90 %) the injected mock FRBs above signal-to-noise ratio (SNR) threshold of 15, and is still acceptable (≳ 80 %) for injected SNRs from 10 to 15. The recovery fraction displays relations with SNR, dispersion measure (DM), and pulse width. No bursts were detected from FRB 20201124A in the middle of 2021. The non-detection of FRB 20201124A may be due to its quiet phase window or no emission above the threshold of Nanshan telescope.