FRB 20121102A monitoring: Updated periodicity in the L band

Abstract

FRB 20121102A was the first fast radio burst to be observed to repeat. Since then, thousands of bursts have been detected by multiple radio telescopes around the world. Previous work has shown an indication of a cyclic activity level with a periodicity of around 160 days. Knowing when the source repeats is essential for planning multi-wavelength monitoring to constrain the emission extent and progenitor source. We report the monitoring of FRB 20121102A using the 100-m Effelsberg radio telescope in the L-band and update the periodicity of the cyclic activity level. We used the Lomb-Scargle periodogram on a sample of 284 observing epochs, of which 42% correspond to detections and 58% to non-detections. Our dataset is composed of the seven epochs of our monitoring plus publicly available data. We investigated two methods: i) a binary model, describing the observing epochs with 1 if there are detections and with 0 for non-detections, and ii) a normalised rates model that considers the inferred detections rates. We report no detections in 12.5-hour observations down to a fluence of 0.29 Jy ms. The best period we find for the cyclic activity window is $159.3\pm 0.8$ days for the binary model and $159.3\pm 0.3$ days for the normalised rates model. We show the activity phase to be 53%. The normalised rates show clear Gaussian-like behaviour for the activity level, in that the number of detections peak at the centre of the activity window. The periodicity found through both methods is consistent for the L and S-band datasets implying it is intrinsic to the source. The activity phase in the S band however, shows an indication of it ending before the L-band activity phase, supporting the idea of a chromatic dependence of the activity window. The sample in the C-band is not large enough to further confirm this result.

7 pages, 5 figures, 2 tables, published in A&A, replaced to match the title

References in corpus (28)

• A bright millisecond radio burst of extragalactic origin
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• The direct localization of a fast radio burst and its host
• The Host Galaxy and Redshift of the Repeating Fast Radio Burst FRB 121102
• Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
• The Repeating Fast Radio Burst FRB 121102 as Seen on Milliarcsecond Angular Scales
• A bimodal burst energy distribution of a repeating fast radio burst source
• Possible periodic activity in the repeating FRB 121102
• A Multi-telescope Campaign on FRB 121102: Implications for the FRB Population
• Repeating behaviour of FRB 121102: periodicity, waiting times and energy distribution
• Chromatic periodic activity down to 120 MHz in a Fast Radio Burst
• A Binary Comb Model for Periodic Fast Radio Bursts
• Periodicity in recurrent fast radio bursts and the origin of ultra long period magnetars
• FRB-periodicity: mild pulsars in tight O/B-star binaries
• A search for optical bursts from the repeating fast radio burst FRB 121102
• Repeating fast radio bursts with WSRT/Apertif
• The FRB 20121102A November rain in 2018 observed with the Arecibo Telescope
• Simultaneous multi-telescope observations of FRB 121102
• Arecibo observations of a burst storm from FRB 20121102A in 2016
• Orbit-induced spin precession as an origin of periodicity in periodically-repeating fast radio bursts
• Constraints on the low frequency spectrum of FRB 121102
• A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts
• FAST early pulsar discoveries: Effelsberg follow-up
• Multiwavelength Radio Observations of Two Repeating Fast Radio Burst Sources: FRB 121102 and FRB 180916.J0158+65
• High frequency study of FRB 20180916B using the 100-m Effelsberg radio telescope
• The arrival time and energy of FRBs traverse the time-energy bivariate space like a Brownian motion
• A possible way to reconcile long-period precession with vortex pinning in neutron stars
• Periodic Activities of Fast Radio Burst Repeaters from Precessing Magnetars with Evolving Obliquity

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