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FNWI --- IMAPP Department of Astrophysics
Radboud University > Faculty of Science > Department of Astrophysics

FRATS

The FRATS project searches for Fast Radio Transients with LOFAR in real-time. These are pulses of a few milliseconds that can originate from a number of objects such as pulsars, rotating radio transients, planets like Jupiter and flaring stars. Of particular interest may be fast radio bursts (FRBS) which could be explained by the formation of black holes. As we do not know when and where such pulses occur, the idea is to cover a large part of the sky at the same time to search for new objects of the known types as well as other candidates like exo-planets.

LOFAR is an almost fully digital telescope. This means that with enough computing power the sky can be looked at in multiple ways. Therefore we can point the telescope to a large part of the sky (~ 0.5 % at 110-190 MHz) in parallel to running observations. In this way we get both a large sky coverage as well as a long observation time. If an interesting pulse is found we obtain the data from each LOFAR element from the Transient Buffer Boards. This data is then analysed to find the origin of the pulse within a few arcseconds (1/3600 of a degree).

Radio Frequency Interference located with LOFAR TBB imaging
Radio Frequency Interference, such as the big blobs in this image caused by a nearby man made transmitter, can be identified and filtered out. This image shows an all-sky map made with the data from a single LOFAR station. Adding more stations will improve the angular resolution with which these interference sources can be identified.The Neutron star that forms the Crab Pulsar sometimes emits a very powerful signal. The FRATS survey will find such pulses from other yet unknown systems. This movie shows a giant pulse from the Crab detected with 4 LOFAR stations. The grid pattern is caused by the relative spacing of these stations.

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