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We are carrying out the GPPS survey by using the FAST, the most sensitivesystematic pulsar survey in the Galactic plane. In addition to about 500pulsars already discovered through normal periodical search, we report here thediscovery of 76 new transient radio sources with sporadic strong pulses,detected by using the newly developed module for a sensitive single pulsesearch. Their small DM values suggest that they all are the Galactic RRATs.More radio pulses have been detected from 26 transient radio sources but noperiods can be found due to a limited small number of pulses from all FASTobservations. The following-up observations show that 16 transient sources arenewly identified as being the prototypes of RRATs with a period alreadydetermined from more detected sporadic pulses, 10 sources are extremely nullingpulsars, and 24 sources are weak pulsars with sparse strong pulses. On theother hand, 48 previously known RRATs have been detected by the FAST. Exceptfor 1 RRAT with four pulses detected in a session of five minute observationand 4 RRATs with only one pulse detected in a session, sensitive FASTobservations reveal that 43 RRATs are just generally weak pulsars with sporadicstrong pulses or simply very nulling pulsars, so that the previously knownRRATs always have an extreme emission state together with a normal hardlydetectable weak emission state. This is echoed by the two normal pulsarsJ1938+2213 and J1946+1449 with occasional brightening pulses. Though strongpulses of RRATs are very outstanding in the energy distribution, theirpolarization angle variations follow the polarization angle curve of theaveraged normal pulse profile, suggesting that the predominant sparse pulses ofRRATs are emitted in the same region with the same geometry as normal weakpulsars.

The FAST Galactic Plane Pulsar Snapshot Survey: II. Discovery of 76 Galactic rotating radio transients and their enigma