CHIME/FRB Detection of a Repeat Burst from ASKAP-Discovered FRB 171019

ATel #13013; C. Patel (McGill University) on behalf of the CHIME/FRB Collaboration
on 9 Aug 2019; 22:40 UT
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Credential Certification: Chitrang Patel (chitrang.patel@mail.mcgill.ca)

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Here we report on the detection of a burst from ASKAP-discovered FRB 171019 (Shannon et al. 2018, Nature, 562, 386) with CHIME/FRB.

The single burst was detected Aug. 5, 2019 at UTC 09:21:08 (topocentric at 400 MHz) at dispersion measure (DM) 460.4+/-0.2 pc/cm^3 from (J2000) R.A. 334.4(3), Dec. -8.5(5). This position and DM are consistent, with negligible chance coincidence probability, with those of FRB 171019 reported by Shannon et al. 2018 (Nature, 562, 386) using data from ASKAP. We are aware that the source has been independently identified as a repeater by the ASKAP team (Kumar et al., in prep.). Our CHIME/FRB single-beam detection has a temporal width of 6+/-2 ms and no evidence for scatter-broadening. We have determined an approximate lower limit on the burst fluence of ~7 Jy ms. Fluence calibration of CHIME/FRB data in this region of the sky is work in progress. A time-frequency ("waterfall") plot of the detected burst can be viewed at http://chime-experiment.ca/figures/CHIMEFRB_ASKAPFRB.png. The sky region for this source is observable by CHIME/FRB for approximately 4 minutes each day; we have a total of 17+/-3 hours of exposure between Aug 28, 2018 and Aug 5, 2019, albeit with yet-to-be-determined sensitivity threshold variations due in part to evolution in our real-time gain and phase calibration strategies. Further observations of the source are encouraged.

The Canadian Hydrogen Intensity Mapping Experiment (CHIME; www.chime-experiment.ca) is a transit radio telescope consisting of four cylindrical reflectors located at the Dominion Radio Astrophysical Observatory near Penticton, British Columbia, Canada. The CHIME Fast Radio Burst (FRB) Project (CHIME/FRB Collaboration, ApJ, 863, 48, 2018) forms 1,024 stationary intensity beams sensitive over a range of 400 - 800 MHz. CHIME/FRB searches for FRBs over an instantaneous field of view of ~200 square degrees in real time.

We acknowledge support from the Dominion Radio Astrophysical Observatory and from our funding agencies (for a full list see CHIME/FRB Collaboration 2018).