Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: Alice P. Curtin, Shion Andrew, Sunil Simha, Alice Cai, Kenzie Nimmo
| Summary:
On 2024 December 28, CHIME/FRB detected the thus-far non-repeating FRB
20241228A with a real-time signal-to-noise ratio of $>50$. Approximately 112~s
later, the X-ray Telescope onboard the Neil Gehrels Swift Observatory was on
source, the fastest follow-up to-date of a non-repeating FRB (Tohuvavohu et al.
in prep.). Using CHIME/FRB and two of the three CHIME/FRB Outriggers, we
obtained a Very Long Baseline Interferometry localization for FRB 20241228A
with a 1$sigma$ confidence ellipse of 11$^{primeprime}$ by
0.2$^{primeprime}$. This represents the first published localization using
both the CHIME-KKO and CHIME-GBO Outriggers. We associate FRB 20241228A with a
star-forming galaxy at a redshift of $z = 0.1614pm0.0002$. The persistent
X-ray luminosity limit at this source’s location and distance is $<1.2 times
10^{43}$ erg s$^{-1}$ in the $0.3-10$ keV band, the most stringent limit of any
non-repeating FRB to-date (Tohuvavohu et al. in prep.). The stellar mass ($sim
2.6 times 10^{10},M_{odot}$) and star formation rate ($sim
2.9,M_{odot}$~yr$^{-1}$) of the host galaxy of FRB 20241228A are consistent
with the broader FRB host galaxy population. We measure significant scattering
($sim$1ms) and scintillation ($sim$20 kHz at 600 MHz) along the line of sight
to this source, and suggest the scintillation screen is Galactic while the
scattering screen is extragalactic. FRB 20241228A represents an exciting
example of a new era in which we can harness VLBI-localizations and rapid
high-energy follow-up to probe FRB progenitors.
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