Bright burst detection from repeating FRB 20240114A at 408 MHz with the Northern Cross radio telescope
ATel #16547; D. Pelliciari (INAF-IRA), A. Geminardi (IUSS), G. Bernardi (INAF-IRA), M. Pilia (INAF-OAC), P. Esposito (IUSS), G. Naldi (INAF-IRA) on behalf of a larger collaboration
on 21 Mar 2024; 09:08 UT
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Credential Certification: Davide Pelliciari (d.pelliciari@ira.inaf.it)
Subjects: Radio, Fast Radio Burst
We report the detection of a bright radio burst from the repeating FRB 20240114A (ATel #16420) with the Northern Cross (NC) radio telescope. As in ATel #16434, observations were carried out with a 16 MHz bandwidth at a central frequency of 408 MHz, with a 14.468 kHz channel width and a 138.24 μs sampling time. We used 16 cylinders of the north-south arm of the NC, 26 minutes per day with similar starting times dictated by the transit of the source. The coordinates used for the observations were instead updated to R.A.: 21:27:39.84, Dec: +04:19:46.34 (J2000), following the source localisation (ATel #16446).
The burst was detected on March 17th, 2024 at 08:56:40.894 UTC (MJD: 60386.3726955376, Barycentric Time of Arrival at 400 MHz). It presents multiple sub-burst components, with the main one (labelled as C1 in the attached Figure) having a FWHM duration of 1.8 ms and a fluence of 124.3 ± 1.5 Jy ms. The second component (C2) arrives 7.5 ms before C1, has a 1.9 ms duration, and a fluence of 24.6 ± 1.5 Jy ms. We also note a third, faint component (C3) arriving 3 ms after C1, with a duration of 1 ms.
The search was performed using Heimdall (Barsdell et al. 2012) and FETCH (Agarwal et al. 2020) spanning a dispersion measure (DM) range between 400 pc cm-3 and 600 pc cm-3 with Signal to Noise Ratio > 7. The burst was then incoherently de-dispersed to a fit-optimized DM = 527.8 pc cm-3, consistent with previous burst detections from the same source and with our previous detection at 408 MHz (ATel #16434). We found no significant difference in DM between the various burst components.
The link below shows the waterfall plot for this burst, with the labels for the different sub-burst components that we found highlighted on top of the de-dispersed time series. The monitoring of the source is still ongoing.
De-dispersed waterfall plot of the detected burst