CHIME/FRB Detection of the Original Repeating Fast Radio Burst Source FRB 121102

Josephy, Alexander; Chawla, Pragya; Fonseca, Emmanuel; Ng, Cherry; Patel, C.; Pleunis, Ziggy; Scholz, Paul; Andersen, Bridget C.; Bandura, Kevin; Bhardwaj, Mohit; Boyce, M. M.; Boyle, P. J.; Brar, Charanjot; Čubranić, Davor; Dobbs, M.; Gaensler, B. M.; Gill, Ajay; Giri, Utkarsh; Good, Deborah C.; Halpern, M.; Hinshaw, G.; Kaspi, V. M.; Landecker, T. L.; Lang, Dustin; Lin, H.; Masui, Kiyoshi; Mckinven, Ryan; Mena-Parra, Juan; Merryfield, Marcus; Michilli, D.; Milutinović, Nikola; Naidu, Arun; Pen, Ue-Li; Rafiei-Ravandi, Masoud; Rahman, Mubdi; Ransom, S. M.; Rénard, A.; Siegel, Seth R.; Smith, Kendrick M.; Stairs, I. H.; Tendulkar, Shriharsh P.; Vanderlinde, K.; Yadav, Prakarsh; Zwaniga, A. V.

doi:10.3847/2041-8213/ab2c00

Cited by 143 publications

(136 citation statements)

References 32 publications

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“…Ultra-wideband or simultaneous multi-band observations will also allow tests of this scintillation model, by characterizing the frequency dependence of the decoherence bandwidth, which we predict to scale as Δν d ∝ν α with α≈4, as discussed above. Similar studies of the original repeating FRB source, FRB 121102, have characterized the observed drift of components to lower frequencies at later times (e.g., Hessels et al 2019;Josephy et al 2019). Caleb et al (2020) fit the drift rate as a function of frequency using a linear model, n µ…”

Section: Discussionmentioning

confidence: 92%

Scintillation Can Explain the Spectral Structure of the Bright Radio Burst from SGR 1935+2154

Simard

Ravi

2020

ApJL

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The discovery of a fast radio burst (FRB) associated with a magnetar in the Milky Way by the Canadian Hydrogen Intensity Mapping Experiment FRB collaboration (CHIME/FRB) and the Survey for Transient Astronomical Radio Emission 2 has provided an unprecedented opportunity to refine FRB emission models. The burst discovered by CHIME/FRB shows two components with different spectra. We explore interstellar scintillation as the origin for this variation in spectral structure. Modeling a weak scattering screen in the supernova remnant associated with the magnetar, we find that a superluminal apparent transverse velocity of the emission region of >9.5c is needed to explain the spectral variation. Alternatively, the two components could have originated from independent emission regions >8.3×10 4 km apart. These scenarios may arise in "far-away" models where the emission originates from well beyond the magnetosphere of the magnetar (for example, through a synchrotron maser mechanism set up by an ultrarelativistic radiative shock), but not in "close-in" models of emission from within the magnetosphere. If further radio observations of the magnetar confirm scintillation as the source of the observed variation in spectral structure, this scattering model thus constrains the location of the emission region.

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Section: Discussionmentioning

confidence: 92%

Scintillation Can Explain the Spectral Structure of the Bright Radio Burst from SGR 1935+2154

Simard

Ravi

2020

ApJL

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“…To date, FRB121102 has been detected at radio frequencies from 600 MHz (Josephy et al 2019) up to 8 GHz (Gajjar et al 2018). Early observations of FRB121102 by Spitler et al (2016) and Scholz et al (2016) demonstrated that the bursts have variable spectra that sometimes peak within the observing band and are often not well modeled by a power law.…”

Section: Discussionmentioning

confidence: 99%

A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts

Majid

Pearlman

Nimmo

et al. 2020

ApJL

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The spectra of repeating fast radio bursts(FRBs) are complex and time-variable, sometimes peaking within the observing band and showing a fractional emission bandwidth of about 10%-30%. These spectral features may provide insight into the emission mechanism of repeating FRBs, or they could possibly be explained by extrinsic propagation effects in the local environment. Broadband observations can better quantify this behavior and help to distinguish between intrinsic and extrinsic effects. We present results from a simultaneous 2.25 and 8.36 GHz observation of the repeating FRB121102 using the 70 m Deep Space Network radio telescope, DSS-43. During the 5.7 hr continuous observing session, we detected six bursts from FRB121102, which were visible in the 2.25 GHz frequency band. However, none of these bursts were detected in the 8.36 GHz band, despite the larger bandwidth and greater sensitivity in the higher-frequency band. This effect is not explainable by Galactic scintillation and, along with previous multi-band experiments, clearly demonstrates that apparent burst activity depends strongly on the radio frequency band that is being observed.

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“…Gajjar et al 2018). More recently, a single burst from this FRB was reported in the upper half of the CHIME 400 -800 MHz band (Josephy et al 2019).…”

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confidence: 83%

Simultaneous multi-telescope observations of FRB 121102

Caleb

Stappers

Abbott

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present 11 detections of FRB 121102 in ∼3 h of observations during its ‘active’ period on the 10th of 2019 September. The detections were made using the newly deployed MeerTRAP system and single pulse detection pipeline at the MeerKAT radio telescope in South Africa. Fortuitously, the Nançay radio telescope observations on this day overlapped with the last hour of MeerKAT observations and resulted in four simultaneous detections. The observations with MeerKAT’s wide band receiver, which extends down to relatively low frequencies (900–1670 MHz usable L-band range), have allowed us to get a detailed look at the complex frequency structure, intensity variations, and frequency-dependent sub-pulse drifting. The drift rates we measure for the full-band and sub-banded data are consistent with those published between 600 and 6500 MHz with a slope of −0.147 ± 0.014 ms−1. Two of the detected bursts exhibit fainter ‘precursors’ separated from the brighter main pulse by ∼28 and ∼34 ms. A follow-up multi-telescope campaign on the 6th and 8th of 2019 October to better understand these frequency drifts and structures over a wide and continuous band was undertaken. No detections resulted, indicating that the source was ‘inactive’ over a broad frequency range during this time.

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CHIME/FRB Detection of the Original Repeating Fast Radio Burst Source FRB 121102

Cited by 143 publications

References 32 publications

Scintillation Can Explain the Spectral Structure of the Bright Radio Burst from SGR 1935+2154

Scintillation Can Explain the Spectral Structure of the Bright Radio Burst from SGR 1935+2154

A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts

Simultaneous multi-telescope observations of FRB 121102

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