Oral Presentation

Wideband detection of FRB 20240114A with the Allen Telescope Array

Author(s): Param Joshi (SETI Institute, USA and NIT Rourkela, India)

Presenter: Param Joshi (SETI Institute, USA and NIT Rourkela, India)

FRB 20240114A, a bright repeating fast radio burst, was initially reported by the CHIME/FRB collaboration on January 26th 2024. High fluence emission (> 10 Jy-ms) from this source have been reported by numerous radio telescopes. Reports by Zhang et al. (2024) at FAST indicate that the bursts exhibit highly band-limited or narrowband emission characteristics, spanning less than ~100 MHz. Similar behaviour has been reported by Kumar et al. (2024) at the uGMRT and at Parkes/Murriyang (Uttarkar et al. 2024). This FRB is localized to a host galaxy J212739.84+041945.8 at redshift Z=0.42 (Tian et al. 2024). In this talk, I will discuss the recent widest bandwidth detection of FRB20240114A utilising the recently upgraded Allen Telescope Array (ATA) of the SETI Institute. For these observations, we targeted two independent 672 MHz spectral bands, one centred at 1.23 GHz (L-band), and another at 1.9 GHz (S-band). We identified eight bursts, with five detected at L-band above our fluence threshold of 3.3 Jy-msec. Of the S-band bursts, two were exclusively visible only at the S-band showing clear emission above 2 GHz, while one was simultaneously detected at both bands. I will compare and contrast how contrary to previous detections, FRB 20240114A exhibits wideband emission bursts spanning a total bandwidth of approximately 800 MHz, and how this wideband emission behaviour can help us in FRB localisation. We will also discuss the energy budget of such a broadband burst which can help scrutinise various emission mechanism models given its distance and host galaxy environment.