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Multiband Detection of Repeating FRB 20180916B

Sand, Ketan R. and Faber, Jakob T. and Gajjar, Vishal and Michilli, Daniele and Andersen, Bridget C. and Joshi, Bhal Chandra and Kudale, Sanjay and Pilia, Maura and Brzycki, Bryan and Cassanelli, Tomas and Croft, Steve and Dey, Biprateep and John, Hoang and Leung, Calvin and Mckinven, Ryan and Ng, Cherry and Pearlman, Aaron B. and Petroff, Emily and Price, Danny C. and Siemion, Andrew and Smith, Kendrick and Tendulkar, Shriharsh P. (2022) Multiband Detection of Repeating FRB 20180916B. Astrophysical Journal, 932 (2). Art. No. 98. ISSN 0004-637X. doi:10.3847/1538-4357/ac6cee.

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We present a multiband study of FRB 20180916B, a repeating source with a 16.3 day periodicity. We report the detection of four, one, and seven bursts from observations spanning 3 days using the upgraded Giant Metrewave Radio Telescope (300–500 MHz), the Canadian Hydrogen Intensity Mapping Experiment (400–800 MHz) and the 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 detections (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 fast radio burst 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 the 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Sand, Ketan R.0000-0003-3154-3676
Faber, Jakob T.0000-0001-9855-5781
Gajjar, Vishal0000-0002-8604-106X
Michilli, Daniele0000-0002-2551-7554
Andersen, Bridget C.0000-0001-5908-3152
Joshi, Bhal Chandra0000-0002-0863-7781
Kudale, Sanjay0000-0002-6631-1077
Pilia, Maura0000-0001-7397-8091
Brzycki, Bryan0000-0002-7461-107X
Cassanelli, Tomas0000-0003-2047-5276
Croft, Steve0000-0003-4823-129X
Dey, Biprateep0000-0002-5665-7912
John, Hoang0000-0001-5591-5927
Leung, Calvin0000-0002-4209-7408
Mckinven, Ryan0000-0001-7348-6900
Ng, Cherry0000-0002-3616-5160
Pearlman, Aaron B.0000-0002-8912-0732
Petroff, Emily0000-0002-9822-8008
Price, Danny C.0000-0003-2783-1608
Siemion, Andrew0000-0003-2828-7720
Smith, Kendrick0000-0002-2088-3125
Tendulkar, Shriharsh P.0000-0003-2548-2926
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2021 November 2; revised 2022 April 22; accepted 2022 April 30; published 2022 June 20. We thank the anonymous referee for their comments that have allowed us to improve our manuscript. We thank Avinash Deshpande, Wael Farah, Akshay Suresh, and Gaurav Waratkar for their helpful insights. We thank the staff of the GMRT that made the uGMRT observations possible. The GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. We acknowledge that CHIME is located on the traditional, ancestral, and unceded territory of the Syilx/Okanagan people. We thank the Dominion Radio Astrophysical Observatory, operated by the National Research Council Canada, for gracious hospitality and expertise. CHIME is funded by a grant from the Canada Foundation for Innovation (CFI) 2012 Leading Edge Fund (Project 31170) and by contributions from the provinces of British Columbia, Québec, and Ontario. The CHIME/FRB Project is funded by a grant from the CFI 2015 Innovation Fund (Project 33213) and by contributions from the provinces of British Columbia and Québec, and by the Dunlap Institute for Astronomy and Astrophysics at the University of Toronto. Additional support was provided by the Canadian Institute for Advanced Research (CIFAR), McGill University and the McGill Space Institute via the Trottier Family Foundation, and the University of British Columbia. Breakthrough Listen is managed by the Breakthrough Initiatives, sponsored by the Breakthrough Prize Foundation ( The Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. J.T.F. was generously supported by the National Science Foundation under the Berkeley SETI Research Center REU Site grant No. 1950897. A.B.P. is a McGill Space Institute (MSI) Fellow and a Fonds de Recherche du Quebec—Nature et Technologies (FRQNT) postdoctoral fellow. E.P. acknowledges funding from an NWO Veni Fellowship. Facilities: GMRT - Giant Meter-wave Radio Telescope, GBT - , CHIME. - Software: astropy (Astropy Collaboration et al. 2013), DM phase (Seymour et al. 2019), DSPSR (van Straten & Bailes 2011), Gptool (Susobhanan et al. 2020), Heimdall (Barsdell et al. 2012), ionFR (Sotomayor-Beltran et al. 2013), Matplotlib (Hunter 2007), Numpy (Harris et al. 2020), PRESTO (Ransom 2011), PSRCHIVE (Hotan et al. 2004; van Straten et al. 2011), Scipy (Virtanen et al. 2020), SIGPROC (Lorimer 2011), SPANDAK (Gajjar et al. 2018).
Funding AgencyGrant Number
Canada Foundation for Innovation31170
Canada Foundation for Innovation33213
Province of British ColumbiaUNSPECIFIED
Province of QuébecUNSPECIFIED
Province of OntarioUNSPECIFIED
Dunlap Institute for Astronomy and AstrophysicsUNSPECIFIED
Canadian Institute for Advanced Research (CIFAR)UNSPECIFIED
McGill UniversityUNSPECIFIED
McGill Space InstituteUNSPECIFIED
Trottier Family FoundationUNSPECIFIED
University of British ColumbiaUNSPECIFIED
Breakthrough Prize FoundationUNSPECIFIED
Fonds de recherche du Québec - Nature et technologies (FRQNT)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Subject Keywords:Radio transient sources; Radio bursts
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Radio transient sources (2008); Radio bursts (1339)
Record Number:CaltechAUTHORS:20220725-156524000
Persistent URL:
Official Citation:Ketan R. Sand et al 2022 ApJ 932 98
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115824
Deposited By: George Porter
Deposited On:27 Jul 2022 17:21
Last Modified:27 Jul 2022 17:21

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