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We present our piggyback search for fast radio bursts using the Nanshan 26mRadio Telescope and the Kunming 40m Radio Telescope. The observations areperformed in the L-band from 1380 MHz to 1700 MHz at Nanshan and S-band from2170 MHz to 2310 MHz at Kunming. We built the \textsc{Roach2}-based FFTspectrometer and developed the real-time transient search software. Weintroduce a new radio interference mitigation technique named \emph{zero-DMmatched filter} and give the formula of the signal-to-noise ratio loss in thetransient search. Though we have no positive detection of bursts in about 1600and 2400 hours data at Nanshan and Kunming respectively, an intriguing perytonwas detected at Nanshan, from which hundreds of bursts were recorded. Perytonsare terrestrial radio signals that mimic celestial fast radio bursts. They werefirst reported at Parkes and identified as microwave oven interferences later.The bursts detected at Nanshan show similar frequency swept emission and havedouble-peaked profiles. They appeared in different sky regions in about tens ofminutes observations and the dispersion measure index is not exactly 2, whichindicates the terrestrial origin. The peryton differs drastically from theknown perytons detected at Parkes, because it appeared in a precise period of$p=1.71287\pm 0.00004$ s. Its origin remains unknown.

monthly notices of the royal astronomical society

Piggyback search for fast radio bursts using Nanshan 26m and Kunming 40m  radio telescopes -- I. Observing and data analysis systems, discovery of a  mysterious peryton