The FAST POP-discovered FRB 20251125A remains active in continued FAST observations

ATel #17934; Y. C. Zhang(NAOC), L. Qian(NAOC), P. Jiang, G. Y. Zhang(NAOC), L. Y. Wang(NAOC), X. Y. Zhang(NAOC), B. Liu(NAOC), Z. Pan(NAOC)
on 1 Aug 2026; 10:04 UT
Credential Certification: Lei Qian (lqian@nao.cas.cn)

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We report the continued FAST tracking observations of FRB 20251125A (DFC005; J2000 RA = 10:23:47.53, J2000 Dec = +09:51:24.74), discovered in the FAST POP (Piggyback Observation of Pulsars, https://fast.bao.ac.cn/cms/article/2034282224688386050) survey (ATel #17837) and subsequently confirmed as a repeating source (ATel #17898). We detected 436 bursts with S/N higher than 7.0 in the FAST L-band tracking observations between 2026 July 14 and 31, with a total exposure of ~30 h. The event rate is 14.51 bursts h^-1, the mean DM is ~578 pc cm^-3 and the mean pulse width is ~16.8 ms. We estimate a DM-inferred redshift of z is 0.51~0.65. As the discovery team of FRB 20251125A, we are performing a follow-up observation with FAST and the FAST Core Array, together with detailed burst analysis and interferometric localization. An accurate position and other follow-up results will be reported upon completion. This work made use of the data from FAST (Five-hundred-meter Aperture Spherical radio Telescope) (https://cstr.cn/31116.02.FAST). FAST is a Chinese national mega-science facility, operated by the National Astronomical Observatories, Chinese Academy of Sciences.

POP, Piggyback Observation of Pulsars