a primary calibration software pipeline for the MWA. There are many articles explaining the detail [@Mitchell2008; @Jacobs2016]. We describe the brief method of the RTS below.

The RTS calibration technique is called “Peeling method”, based on the catalogue of apparent bright sources in southern sky and performed in visibility space. The point source catalogue of the EoR0 field is build using the the Positional Update and Matching Algorithm (PUMA) [@2017PASA...34....3L]. The catalogue is used in the main calibration process of the RTS, named Calibrator Measurement Loop (CML). During the CML process, firstly, the models visibilities of all sources are subtracted from the data. Secondly, the visibilities of the target sources are returned into the subtracted data. Then, the data is dominated by the target source, and one can measure the ionospheric offsets from a phase ramp by fitting to the visibility phased to the position of the aimed source. In this work, the ionospheric offset is corrected using 1000 point sources. Finally, 5 brightest sources in the catalogue are used to correct the direction-dependent antenna gains. After the calibration, the 1000 point sources are peeled from the visibility. Using the calibrated visibilities, the RTS imager provides the snapshot images with 