We present a multiband study of FRB 20180916B, a repeating source with a 16.3 day periodicity. We report the detection of 4, 1 and 7 bursts from observations spanning 3 days using upgraded Giant Metrewave Radio Telescope (300-500 MHz), Canadian Hydrogen Intensity Mapping Experiment (400-800 MHz) and Green Bank Telescope (600-1000 MHz), respectively. We report the first-ever detection of the source in the 800-1000 MHz range along with one of the widest instantaneous bandwidth detection (200 MHz) at lower frequencies. We identify 30 μs wide structures in one of the bursts at 800 MHz, making it the lowest frequency detection of such structures for this FRB thus far. There is also a clear indication of high activity of the source at a higher frequency during earlier phases of the activity cycle. We identify a gradual decrease in the rotation measure over two years and no significant variations in the dispersion measure. We derive useful conclusions about progenitor scenarios, energy distribution, emission mechanisms, and variation of downward drift rate of emission with frequency. Our results reinforce that multiband observations are an effective approach to study repeaters and even one-off events to better understand their varying activity and spectral anomalies.
@article{arxiv.2111.02382,
title = {Multiband Detection of Repeating FRB 20180916B},
author = {Ketan R. Sand and Jakob Faber and Vishal Gajjar and Daniele Michilli and Bridget C. Andersen and Bhal Chandra Joshi and Sanjay Kudale and Maura Pilia and Bryan Brzycki and Tomas Cassanelli and Steve Croft and Biprateep Dey and Hoang John and Calvin Leung and Ryan Mckinven and Cherry Ng and Aaron B. Pearlman and Emily Petroff and Danny C. Price and Andrew Siemion and Kendrick Smith and Shriharsh P. Tendulkar},
journal= {arXiv preprint arXiv:2111.02382},
year = {2022}
}