DSA-110 discovery and localization of repeating source FRB 20230814A
ATel #16191; Vikram Ravi on behalf of the DSA-110 team
on 16 Aug 2023; 06:45 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Vikram Ravi (v.vikram.ravi@gmail.com)
Subjects: Radio, Fast Radio Burst
We report the discovery and interferometric localization of the repeating source FRB 20230814A with the Deep Synoptic Array (DSA-110). Bursts were detected on MJDs 60123.490223 and 60170.360927 at an approximate dispersion measure (DM) of 696.4 pc/cm^3, with detection S/N ratios of 72.6 and 45.1 respectively. Although only intensity data were saved for the former burst, raw voltage data were saved for the latter burst that enabled interferometric localization and full-polarization analysis.
Our best-fit preliminary localization for FRB 20230814A is
22h23m53.9s +73d01m33.3s (J2000)
The uncertainty in this localization is approximately 2" in RA and 1" in DEC.
A preliminary analysis of polarimetric data on the MJD 60170 burst from FRB 20230814A shows that it is highly polarized, with both linear and circular polarization detected. A Faraday rotation measure of -19 +- 1 rad/m^2 was estimated.
The MJD 60170 burst from FRB 20230814A was coincident (temporally, spatially, and in DM) with an S/N 17.2 burst candidate reported by the CHIME/FRB VOEvent service. DSA-110 and CHIME are located at nearly the same geographic longitude, and as transit instruments have overlapping regions of sensitivity on the sky.
We encourage follow-up observations of FRB 20230814A. The coincident detection of a burst by DSA-110 and CHIME/FRB motivates radio follow-up across the 400-1500 MHz band.
Data on this source, including a waterfall plot, are linked below.
The DSA-110 is supported by the National Science Foundation Mid-Scale Innovations Program in Astronomical Sciences (MSIP) under grant AST-1836018. This research has made use of the CHIME/FRB VOEvent Service.
https://www.wis-tns.org/object/20230814a
