Bright radio bursts from the active FRB 20220912A detected with the Allen Telescope Array
ATel #15735; S. Sheikh (SETI Institute / University of California, Berkeley "UCB"), W. Farah (SETI Institute / UCB), A. W. Pollak (SETI / UCB), A. P. V. Siemion (SETI / UCB), L. Cruz (SETI), S. Schoultz (SETI), J. Hickish (Real-time Radio Systems Ltd / SETI), P. Premnath (SETI), R. Maddalena (Green Bank Observatory), D. DeBoer (SETI / UCB), V. Gajjar (UCB), R. Donnachie (SETI), G. Singh (SETI), R. H. Davis (SETI), M. Snodgrass (SETI), P. Karn (SETI)
on 1 Nov 2022; 23:57 UT
Credential Certification: Wael Farah (wfarah@seti.org)
Subjects: Radio, Fast Radio Burst
Referred to by ATel #: 15806
We report the detection of radio bursts from the repeating source FRB 20220912A (CHIME/FRB collaboration ATel #15679) using the Allen Telescope Array (ATA). For these observations, 20 of the 42, 6.1-m dishes were tuned to two independent 672 MHz spectral bands, one centered at 1.4 GHz, and another at 3 GHz. The data from the 20 available antennas were then coherently summed, detected and time-integrated to produce final data products at 0.5 MHz and 64 microsecond resolution. The data were then processed using the GPU-accelerated dedispersion algorithm, HEIMDALL (Barsdell 2012) and the candidate-vetting algorithm SPANDAK (Gajjar et al. 2018). For our observations, we first pointed at the coordinates provided by the initial DSA-110 localisation (23h09m05.49s + 48d42m25.6s, ATel #15693) and then the updated DSA-110 coordinates from ATel #15716 (23h09m04.9s +48d42m25.4s).
Eight bursts from FRB 20220912A were detected since the CHIME/FRB collaboration detection between Oct 15th 2022 and Oct 29th 2022. The bright bursts detected by the ATA exhibit the "downward drifting" effect as typically seen with other repeating FRBs, and the bursts' pulse and subpulse fluence vary between 10 and 330 Jy-ms at L-band. No simultaneous bursts above the detection limit (4 Jy-ms for 1 ms burst) were detected at 3 GHz at the time of the bright pulses.
Additional observations of FRB 20220912A with the ATA are currently underway. The detections described here, as well as others, indicate that the source is still highly active, and we encourage robust follow-up.
SPANDAK plots for the 8 bursts detected so far with the ATA, and "filterbank" files for the brightest three (MJDs = 59880.272023, 59880.395557, 59880.402931) can be found here. Additional data are available upon request.
