Detection of bright burst at 650 MHz from repeating FRB 20251130A using the uGMRT
ATel #17557; Ujjwal Panda (NCRA-TIFR), Chahat Dudeja (NCRA-TIFR), Kshitij Bane (NCRA-TIFR), Sridhar Gajendran (NCRA-TIFR), and Jayanta Roy (NCRA-TIFR)
on 23 Dec 2025; 18:01 UT
Credential Certification: Jayanta Roy (jroy@ncra.tifr.res.in)
Subjects: Radio, Transient, Fast Radio Burst
Referred to by ATel #: 17596
We report the detection of a bright burst from the repeating FRB 20251130A, observed using the uGMRTâs Band 4 (550 to 750 MHz) receivers between 21st December 2025, 23:48:34 to 22nd December 2025, 02:31:41 UTC, above 10-sigma significance. We followed up on this FRB after its detection was reported by the MeerTRAP collaboration (ATel #17548). We observed the FRB using GMRTâs post-correlation phased array (PC) beam for 2.5 hours, formed towards the position given in ATel #17548. A bright burst was detected in the first scan on the source at MJD = 61031.02434335222, with an S/N of 19.04, a structure-optimised DM of 975.89 +/- 0.05 pc cm^-3, and a fluence of 1.1 Jy ms. The emission from the burst was band-limited to 100 MHz, over a band of 595 to 695 MHz, and had multiple components, with intrinsic widths of 1.388 +/- 0.338 ms and 6.89 +/- 0.042 ms, and scattering timescales of 2.371 ms and 0.0373 ms, respectively. A downward drift is also seen. We would like to thank the operations group of the observatory for the prompt scheduling of our observations. The GMRT is run by the National Centre for Radio Astrophysics, of the Tata Institute of Fundamental Research.
The dynamic spectrum of the detected burst can be found here
