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# A bright millisecond-duration radio burst from a Galactic magnetar

## Relevant articles

• ### Fast radio bursts at the dawn of the 2020s

The Astronomy and Astrophysics Review Open Access 29 March 2022

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## Data availability

The data used in this publication are available at https://chime-frb-open-data.github.io and in the repository at https://doi.org/10.11570/20.0006.

## Code availability

The code used in this publication is available at https://chime-frb-open-data.github.io.

## References

1. Kaspi, V. M. & Beloborodov, A. M. Magnetars. Annu. Rev. Astron. Astrophys. 55, 261–301 (2017).

2. Olausen, S. A. & Kaspi, V. M. The McGill Magnetar Catalog. Astrophys. J. Suppl. Ser. 212, 6 (2014).

3. Esposito, P. et al. A very young radio-loud magnetar. Astrophys. J. Lett. 896, 30 (2020).

4. Petroff, E., Hessels, J. W. T. & Lorimer, D. R. Fast radio bursts. Astron. Astrophys. Rev. 27, 4 (2019).

5. Spitler, L. G. et al. A repeating fast radio burst. Nature 531, 202–205 (2016).

6. The CHIME/FRB Collaboration. CHIME/FRB detection of eight new repeating fast radio burst sources. Astrophys. J. Lett. 885, 24 (2019).

7. Kumar, P. et al. Faint repetitions from a bright fast radio burst source. Astrophys. J. Lett. 887, 30 (2019).

8. Fonseca, E. et al. Nine new repeating fast radio burst sources from CHIME/FRB. Astrophys. J. Lett. 891, 6 (2020).

9. Lyubarsky, Y. A model for fast extragalactic radio bursts. Mon. Not. R. Astron. Soc. 442, L9–L13 (2014).

10. Beloborodov, A. M. A flaring magnetar in FRB 121102? Astrophys. J. Lett. 843, 26 (2017).

11. Metzger, B. D., Margalit, B. & Sironi, L. Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves. Mon. Not. R. Astron. Soc. 485, 4091–4106 (2019).

12. CHIME/FRB Collaboration et al. The CHIME Fast Radio Burst Project: system overview. Astrophys. J. 863, 48 (2018).

13. Palmer, D. M. A forest of bursts from SGR 1935+2154. Astron. Telegr. 13675 (2020).

14. Israel, G. L. et al. The discovery, monitoring and environment of SGR J1935+2154. Mon. Not. R. Astron. Soc. 457, 3448–3456 (2016).

15. Cordes, J. M. & Lazio, T. J. W. NE2001. I. A new model for the galactic distribution of free electrons and its fluctuations. Preprint at https://arxiv.org/abs/astro-ph/0207156 (2002).

16. Yao, J. M., Manchester, R. N. & Wang, N. A new electron-density model for estimation of pulsar and FRB distances. Astrophys. J. 835, 29 (2017).

17. He, C., Ng, C.-Y. & Kaspi, V. The correlation between dispersion measure and X-ray column density from radio pulsars. Astrophys. J. 768, 64 (2013).

18. Kothes, R., Sun, X., Gaensler, B. & Reich, W. A radio continuum and polarization study of SNR G57.2+0.8 associated with magnetar SGR 1935+2154. Astrophys. J. 852, 54 (2018).

19. Zhang, C. F. et al. A highly polarised radio burst detected from SGR 1935+2154 by FAST. Astron. Telegr. 13699 (2020).

20. CHIME/FRB. A fast radio burst associated with a Galactic magnetar. Nature https://doi.org/10.1038/s41586-020-2872-x (2020).

21. Zhou, P. et al. Revisiting the distance, environment and supernova properties of SNR G57.2+0.8 that hosts SGR 1935+2154. Preprint at https://arxiv.org/abs/2005.03517 (2020).

22. Mereghetti, S. et al. INTEGRAL IBIS and SPI-ACS detection of a hard X-ray counterpart of the radio burst from SGR 1935+2154. Astron. Telegr. 13685 (2020).

23. Ridnaia, A. et al. Konus-Wind observation of hard X-ray counterpart of the radio burst from SGR 1935+2154. Astron. Telegr. 13688 (2020).

24. Zhang, S. N. et al. Insight-HXMT X-ray and hard X-ray detection of the double peaks of the fast radio burst from SGR 1935+2154. Astron. Telegr. 13696 (2020).

25. Zhang, S. N. et al. Geocentric time correction for Insight-HXMT detection of the X-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154. Astron. Telegr. 13704 (2020).

26. Tendulkar, S. P., Kaspi, V. M. & Patel, C. Radio nondetection of the SGR 1806–20 giant flare and implications for fast radio bursts. Astrophys. J. 827, 59 (2016).

27. Scholz, P. et al. Simultaneous X-ray, gamma-ray, and radio observations of the repeating fast radio burst FRB 121102. Astrophys. J. 846, 80 (2017).

28. von Kienlin, A. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs. GCN Circ. 26163 (2019).

29. Ambrosi, E., D’Elia, V., Kennea, J. A. & Palmer, D. Trigger 933276: Swift detection of further activity from SGR 1935+2154. GCN Circ. 26169 (2019).

30. Palmer, D. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154. GCN Circ. 26171 (2019).

31. Pearlman, A. B., Majid, W. A., Prince, T. A., Kocz, J. & Horiuchi, S. Pulse morphology of the Galactic Center magnetar PSR J1745–2900. Astrophys. J. 866, 160 (2018).

32. Hessels, J. W. T. et al. FRB 121102 bursts show complex time–frequency structure. Astrophys. J. Lett. 876, 23 (2019).

33. Burgay, M. et al. Search for FRB and FRB-like single pulses in Parkes magnetar data. In Pulsar Astrophysics: the Next Fifty Years (eds Weltevrede, P. et al.) 319–321 (2018).

34. Bera, A. & Chengalur, J. N. Super-giant pulses from the Crab pulsar: energy distribution and occurrence rate. Mon. Not. R. Astron. Soc. 490, L12–L16 (2019).

35. Marcote, B. et al. A repeating fast radio burst source localized to a nearby spiral galaxy. Nature 577, 190–194 (2020).

36. The CHIME/FRB Collaboration. Periodic activity from a fast radio burst source. Nature 582, 351–355 (2020).

37. Patel, C. et al. PALFA single-pulse pipeline: new pulsars, rotating radio transients, and a candidate fast radio burst. Astrophys. J. 869, 181 (2018).

38. Pol, N., Lam, M. T., McLaughlin, M. A., Lazio, T. J. W. & Cordes, J. M. Estimates of fast radio burst dispersion measures from cosmological simulations. Astrophys. J. 886, 135 (2019).

39. Shannon, R. M. et al. The dispersion–brightness relation for fast radio bursts from a wide-field survey. Nature 562, 386–390 (2018).

40. Hurley, K. et al. An exceptionally bright flare from SGR 1806–20 and the origins of short-duration γ-ray bursts. Nature 434, 1098–1103 (2005).

41. Lyutikov, M. Radio emission from magnetars. Astrophys. J. Lett. 580, 65–68 (2002).

42. Kumar, P., Lu, W. & Bhattacharya, M. Fast radio burst source properties and curvature radiation model. Mon. Not. R. Astron. Soc. 468, 2726–2739 (2017).

43. Zhang, Y. G. et al. Fast radio burst 121102 pulse detection and periodicity: a machine learning approach. Astrophys. J. 866, 149 (2018).

44. Bhandari, S. et al. The Survey for Pulsars and Extragalactic Radio Bursts—II. New FRB discoveries and their follow-up. Mon. Not. R. Astron. Soc. 475, 1427–1446 (2018).

45. Ravi, V. The prevalence of repeating fast radio bursts. Nat. Astron. 3, 928–391 (2019).

46. Agarwal, D. et al. A fast radio burst in the direction of the Virgo cluster. Mon. Not. R. Astron. Soc. 490, 1–8 (2019).

47. Taylor, M. et al. The core collapse supernova rate from the SDSS-II Supernova Survey. Astrophys. J. 792, 135 (2014).

48. Gourdji, K. et al. A sample of low-energy bursts from FRB 121102. Astrophys. J. Lett. 877, 19 (2019).

49. Gajjar, V. et al. Highest frequency detection of FRB 121102 at 4–8 GHz using the Breakthrough Listen digital backend at the Green Bank Telescope. Astrophys. J. 863, 2 (2018).

50. Bannister, K. W. et al. A single fast radio burst localized to a massive galaxy at cosmological distance. Science 365, 565–570 (2019).

51. Ng, C. et al. CHIME FRB: an application of FFT beamforming for a radio telescope. In Proc. XXXII General Assembly and Scientific Symp. Intl Union of Radio Science (URSI GASS) J33-2 (2017).

52. Masui, K. W. et al. Algorithms for FFT beamforming radio interferometers. Astrophys. J. 879, 16 (2019).

53. Foreman-Mackey, D., Hogg, D. W., Lang, D. & Goodman, J. emcee: the MCMC hammer. Publ. Astron. Soc. Pacif. 125, 306 (2013).

54. Newburgh, L. B. et al. Calibrating CHIME: a new radio interferometer to probe dark energy. Proc. SPIE 9145, 91454V (2014).

55. Berger, P. et al. Holographic beam mapping of the CHIME pathfinder array. In Ground-based and Airborne Telescopes VI (eds Hall, H. J., Gilmozzi, R. & Marshall, H. K.) 99060D (SPIE, 2016).

56. Bandura, K. et al. Canadian Hydrogen Intensity Mapping Experiment (CHIME) pathfinder. In Ground-based and Airborne Telescopes V (eds Stepp, L. M., Gilmozzi, R. & Hall, H. J.) 914522 (SPIE, 2014).

57. Bandura, K. et al. ICE: a scalable, low-cost FPGA-based telescope signal processing and networking system. J. Astron. Instrum. 5, 1641005 (2016).

58. Burn, B. J. On the depolarization of discrete radio sources by Faraday dispersion. Mon. Not. R. Astron. Soc. 133, 67–83 (1966).

59. Brentjens, M. A. & de Bruyn, A. G. Faraday rotation measure synthesis. Astron. Astrophys. 441, 1217–1228 (2005).

60. Sobey, C. et al. Low-frequency Faraday rotation measures towards pulsars using LOFAR: probing the 3D Galactic halo magnetic field. Mon. Not. R. Astron. Soc. 484, 3646–3664 (2019).

61. Ester, M., Kriegel, H.-P., Sander, J. & Xu, X. A density-based algorithm for discovering clusters in large spatial databases with noise. In Proc. Second Intl Conf. Knowledge Discovery and Data Mining, KDD’96 (eds Simoudis, E., Han, J. & Fayyad, U.) 226–231 (AAAI, 1996).

62. Arnaud, K. A. Xspec: the first ten years. In Astronomical Data Analysis Software and Systems V (eds Jacoby, G. & Barnes, J.) 17 (ASP, 1996).

63. Karachentsev, I. D. & Kaisina, E. I. Star formation properties in the local volume galaxies via Hα and far-ultraviolet fluxes. Astron. J. 146, 46 (2013).

64. Jarrett, T. H. et al. The WISE Extended Source Catalog (WXSC). I. The 100 largest galaxies. Astrophys. J. Suppl. Ser. 245, 25 (2019).

65. Gehrels, N. Confidence limits for small numbers of events in astrophysical data. Astrophys. J. 303, 336–346 (1986).

## Author information

### Contributions

All authors from the CHIME/FRB Collaboration had either leadership or significant supporting roles in one or more of: the management, development and construction of the CHIME telescope, the CHIME/FRB instrument and the CHIME/FRB software data pipeline, the commissioning and operations of the CHIME/FRB instrument, the data analysis and preparation of this manuscript. All authors from the CHIME Collaboration had either leadership or significant supporting roles in the management, development and construction of the CHIME telescope.

### Corresponding author

Correspondence to P. Scholz.

## Ethics declarations

### Competing interests

The authors declare no competing interests.

Peer review information Nature thanks Evan Keane and Amanda Weltman for their contribution to the peer review of this work. Peer reviewer reports are available.

Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

## Extended data figures and tables

### Extended Data Fig. 1 Burst fitting.

ad, Dynamic spectra and band-averaged time series (referenced to the geocentre) of fitted burst models (a), beam-attenuated burst models (b), burst data as in Fig. 1 (c) and fit residuals (d). Dynamic spectra are displayed at 0.98304-ms and 1.5625-MHz resolution, with intensity values capped at the 1st and 99th percentiles, except in d where values are capped at ±3σ around 0. The time series of bd have the same scaling. The beam attenuation of the maxima in the model dynamic spectra is about 1,700×.

### Extended Data Fig. 2 Polarized intensity Faraday spectra for the two bursts.

a, The Faraday spectrum FB1 for the first sub-burst from Stokes Q and U after correcting for a leakage between Stokes U and V. b, Faraday spectrum $${F}_{{\rm{B}}2}^{\ast }$$ for the second sub-burst from a single polarized flux of the ARO 10-m dish. c, The cross spectrum Fcross = $$\sqrt{{F}_{{\rm{B}}1}{F}_{{\rm{B}}2}^{\ast }}$$ from the ARO 10-m dish, magnified near the peak. d, The cross spectrum from CHIME intensity data. The oscillations of the Stokes Q from Faraday rotation have leaked to the summed intensity, owing to the different response of the two linear receivers in the far sidelobe. The black lines show the amplitude of the spectra; the blue and orange lines are the real and imaginary parts of the spectra, respectively. The phase of the cross spectrum corresponds to the PA difference between the two bursts. When the real part approaches the amplitude, the two bursts have the same PA. The yellow dashed vertical line is drawn at RM = 116 rad m−2. L is the linear polarization, I is the total intensity and their indices refer to the first and second bursts.

### Extended Data Fig. 3 The polarization spectra for the first observed burst from the ARO 10-m telescope.

ad, The spectrum of the first burst in the Stokes I parameter and its cubic spline-smoothed version (black line) (a), the Stokes Q parameter divided by the total linear polarization, L (b), the Stokes U parameter divided by the total linear polarization (c), and the uncalibrated polarization angle, ψ (d). The frequency channels with greater polarized intensity are indicated with darker points. The best-fit model of the Faraday rotation modulation with an RM of 116 rad m−2 is indicated by the black lines in b and c. The best-fit model of the uncalibrated polarization angle is indicated with the solid red line in d. Error bars are 1σ.

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The CHIME/FRB Collaboration. A bright millisecond-duration radio burst from a Galactic magnetar. Nature 587, 54–58 (2020). https://doi.org/10.1038/s41586-020-2863-y

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• DOI: https://doi.org/10.1038/s41586-020-2863-y

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