ASKAP detection of FRB 191228

Authors: R. M. Shannon (Swinburne University of Technology, SUT), C. Day (SUT), P. Kumar (SUT), on behalf of the ASKAP-CRAFT collaboration.

We report the detection of a Fast Radio Burst (FRB) with the Australian Square Kilometre Array Pathfinder (ASKAP), as part of the Commensal Real Time Fast Transient (CRAFT) survey science project. The burst, FRB 191228, was detected with a reported signal to noise ratio of 22 in the incoherent sum of 28 antennas.  The system was operating with a central frequency of 1272.5 MHz, an observing bandwidth of 336 MHz, and a time resolution of 1.7 ms.

A preliminary localization was made using the multi beam approach described in Bannister et al. (2017, ApJL, 841,12). The properties of the burst are as follows:

  • Date: 2019-12-28.386301440(1)
  • UTC:  09:16:16.4440(2)
  • RA (J2000): 22:57(2)
  • DEC (J2000): -29:46(40)
  • DM: 297.9(5) pc cm-3
  • Fluence: 40(+50/-10) Jy ms

Quoted uncertainties are with 90% confidence.

The burst was detected at a Galactic latitude of -64.9 deg. and a Galactic longitude of 20.6 deg.  The Galactic dispersion measure in this direction is modelled to be 33 pc cm-3 (Cordes & Lazio, arXiv:0207156) and 20 pc cm-3 (Yao et al., 2017, ApJ, 835, 29).

A plot of the dynamic spectrum of the burst is shown below: