Bright burst detection from FRB 20240114A at 327 MHz using the Westerbork RT1 25-m telescope

ATel #16432; O. S. Ould-Boukattine (ASTRON, UvA), J. W.T. Hessels (UvA, ASTRON), F. Kirsten (Chalmers), D. M. Hewitt (UvA), M. P. Snelders (ASTRON, UvA), R. Blaauw (ASTRON), J. J. Sluman (ASTRON), H. Mulder (ASTRON), W. Herrmann (Astropeiler Stockert e. V.), M. Gawronski (NCU, Torun), W. Puchalska (NCU, Torun), A. Gopinath (UvA)
on 5 Feb 2024; 19:14 UT
Credential Certification: Jason W.T. Hessels (j.w.t.hessels@uva.nl)

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We report the detection of a bright radio burst originating from FRB 20240114A (ATel #16420) using the Westerbork RT1 25-m telescope. Observations were carried out at a central frequency of 327 MHz using a bandwidth of 54 MHz.

The preliminary properties of the burst are:

Arrival time (MJD, TDB): 60341.538079081

Fluence: 224 +/- 45 Jy ms

The arrival time is referenced to infinite frequency at the solar system barycentre (in TDB) using a dispersion measure (DM) of 527.7 pc cm^-3, as determined by CHIME/FRB in the discovery (ATel #16420), and a DM constant of 1/(2.41 x 10^-4) MHz^2 pc^-1 cm^3 s. Our burst is consistent with the DM reported by CHIME/FRB. The fluence is determined by averaging over the entire observing bandwidth and by applying the radiometer equation using a system equivalent flux density (SEFD) of 2100 Jy. We estimate a 20% error on the fluence which arises from the uncertainty on the SEFD of the telescope.

Since its discovery, we have been monitoring the source using multiple 25-m and 32-m dishes in Europe - both at 327 MHz (P-band) and 1350 MHz (L-band) for up to 10 hours per day. Up until the burst detection we observed the source for 19 hours at P-band and 21 hours at L-band. The completeness threshold for 8-sigma detections corresponds to a fluence of 10 Jy ms and 80 Jy ms for L-band and P-band, respectively. Thus far we have not detected a burst at L-band. We note that this source is detectable at L-band, given the recent discovery of a multitude of bursts using the UWL receiver at the Parkes/Murriyang radio telescope (ATel #16430).

The detection of a bright burst from FRB 20240114A after limited exposure could indicate that the source is still highly active. We therefore encourage follow-up observations at all wavelengths.

Plot of dynamic spectrum and timeseries of the burst