# Study of Three Rotating Radio Transients with FAST

## TL;DR

This study uses FAST to observe three RRATs, revealing higher burst rates and detailed pulse profile variations, advancing understanding of their emission mechanisms.

## Contribution

The paper provides new high-sensitivity observations of three RRATs, analyzing their pulse profiles and flux evolution, and models their frequency-dependent profiles.

## Key findings

- Higher burst rates observed with FAST compared to previous data.
- RRAT J1854+0306 shows dynamic pulse profile over time.
- Profiles at different frequencies fit cone-core and conal-beam models.

## Abstract

Rotating radio transients (RRATs) are peculiar astronomical objects whose emission mechanism remains under investigation. In this paper, we present observations of three RRATs, J1538+2345, J1854+0306 and J1913+1330, observed with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Specifically, we analyze the mean pulse profiles and temporal flux density evolutions of the RRATs. Owing to the high sensitivity of FAST, the derived burst rates of the three RRATs are higher than those in previous reports. RRAT J1854+0306 exhibited a time-dynamic mean pulse profile, whereas RRAT J1913+1330 showed distinct radiation and nulling segments on its pulse intensity trains. The mean pulse profile variation with frequency is also studied for RRAT J1538+2345 and RRAT J1913+1330, and the profiles at different frequencies could be well fitted with a cone-core model and a conal-beam model, respectively.