Rebrightness of FRB 20220529
ATel #17310; Xuan Yang (PMO), Ye Li (PMO), Song-Bo Zhang (PMO), Jia-Rui Niu (NAOC), Yuan-Pei Yang (YNU), Wei-Wei Zhu (NAOC), Xue-Feng Wu (PMO)
on 26 Jul 2025; 09:05 UT
Credential Certification: Xuan Yang (yangxuan@pmo.ac.cn)
Subjects: Radio, Transient, Fast Radio Burst
We observed the repeating fast radio burst FRB 20220529 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) for 20 minutes starting at 2025-07-23 21:27:00 UTC. The pointing center was at (RA, Dec) = (01h 16m 25.01s, +20d 37m 57.0s; J2000). Five bursts were detected with signal-to-noise ratios (S/N) above 7, corresponding to an event rate of approximately 15 per hour above a fluence threshold of 0.015 Jy ms, assuming an average burst width of 3 ms.
The brightest event reached an S/N of 682 at MJD 60879.90512561738 (topocentric, 1.5 GHz), corresponding to a peak flux density of 4.5 Jy and a fluence of 16.0 Jy ms. Including three earlier FAST sessions over the preceding 10 days (1 hour on 2025-07-17 and 0.5 hours on 2025-07-22, with 8 and 5 faint pulses detected, respectively), we estimate the rate of such bright bursts to be 0.5 per hour, with a 1 sigma Poisson confidence interval of 0.1 to 1.8 per hour.
This result confirms that FRB 20220529 continues to emit bright bursts that are detectable even by moderately sensitive radio telescopes. Given the detection of this bright event and the likelihood of even brighter bursts from this source, we encourage continued monitoring by other facilities, including those equipped with ~10-meter-class dishes.
A link to the waterfall of this pulse:
https://github.com/Astroyx/FRB20220529/blob/main/20250724_FRB20220529A_tracking-M01_0151.add_60879.90512561738_cut_mb8_-120.832.png
Waterfall of the pulse
