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Fast radio bursts (FRBs) constitute an emerging class of fast radio transientwhose origin continues to be a mystery. Realizing the importance of increasingcoverage of the search parameter space, we have designed, built, and deployed arealtime monitor for FRBs at the 305-m Arecibo radio telescope. Named'ALFABURST', it is a commensal instrument that is triggered whenever the 1.4GHz seven-beam Arecibo $L$-Band Feed Array (ALFA) receiver commences operation.The ongoing commensal survey we are conducting using ALFABURST has aninstantaneous field of view of 0.02 sq. deg. within the FWHM of the beams, withthe realtime software configurable to use up to 300 MHz of bandwidth. We searchfor FRBs with dispersion measure up to 2560 cm$^{-3}$ pc and pulse widthsranging from 0.128 ms to 16.384 ms. Commissioning observations performed overthe past few months have demonstrated the capability of the instrument indetecting single pulses from known pulsars. In this paper, I describe theinstrument and the associated survey.

ALFABURST: A realtime fast radio burst monitor for the Arecibo telescope