### Abstract

The angular clustering of 5 Ultrahigh Energy Cosmic Rays (UHECRs) in the combined published AGASA-HiRes data has a probability of 2103 of occurring by chance. A first analysis of the implications of the event energies and angular spreading is presented, which is applicable if the source is close enough that GZK losses can be ignored. Under this assumption, the observed energies of the events in this cluster favor a bursting rather than continuously emitting source, with the events emitted on a time scale short compared with 300DMpc years. Assuming the UHECRs experience many incoherent small magnetic deflections enroute from source to Earth, the arrival direction distribution allows estimation that hB2iD 7.7 nG2Mpc2. If the spectrum at the source E2, the total isotropic equivalent energy emitted in UHECRs is 1043 D3 Mpc ergs.

Original language | English (US) |
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Title of host publication | Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007 |

Publisher | Universidad Nacional Autonoma de Mexico |

Pages | 161-164 |

Number of pages | 4 |

Volume | 2 |

Edition | OG PART 1 |

State | Published - 2007 |

Event | 30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico Duration: Jul 3 2007 → Jul 11 2007 |

### Other

Other | 30th International Cosmic Ray Conference, ICRC 2007 |
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Country | Mexico |

City | Merida, Yucatan |

Period | 7/3/07 → 7/11/07 |

### Fingerprint

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007*(OG PART 1 ed., Vol. 2, pp. 161-164). Universidad Nacional Autonoma de Mexico.

**Evidence that a cluster of UHECRs was produced by a burst or flare.** / Farrar, Glennys R.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007.*OG PART 1 edn, vol. 2, Universidad Nacional Autonoma de Mexico, pp. 161-164, 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico, 7/3/07.

}

TY - GEN

T1 - Evidence that a cluster of UHECRs was produced by a burst or flare

AU - Farrar, Glennys R.

PY - 2007

Y1 - 2007

N2 - The angular clustering of 5 Ultrahigh Energy Cosmic Rays (UHECRs) in the combined published AGASA-HiRes data has a probability of 2103 of occurring by chance. A first analysis of the implications of the event energies and angular spreading is presented, which is applicable if the source is close enough that GZK losses can be ignored. Under this assumption, the observed energies of the events in this cluster favor a bursting rather than continuously emitting source, with the events emitted on a time scale short compared with 300DMpc years. Assuming the UHECRs experience many incoherent small magnetic deflections enroute from source to Earth, the arrival direction distribution allows estimation that hB2iD 7.7 nG2Mpc2. If the spectrum at the source E2, the total isotropic equivalent energy emitted in UHECRs is 1043 D3 Mpc ergs.

AB - The angular clustering of 5 Ultrahigh Energy Cosmic Rays (UHECRs) in the combined published AGASA-HiRes data has a probability of 2103 of occurring by chance. A first analysis of the implications of the event energies and angular spreading is presented, which is applicable if the source is close enough that GZK losses can be ignored. Under this assumption, the observed energies of the events in this cluster favor a bursting rather than continuously emitting source, with the events emitted on a time scale short compared with 300DMpc years. Assuming the UHECRs experience many incoherent small magnetic deflections enroute from source to Earth, the arrival direction distribution allows estimation that hB2iD 7.7 nG2Mpc2. If the spectrum at the source E2, the total isotropic equivalent energy emitted in UHECRs is 1043 D3 Mpc ergs.

UR - http://www.scopus.com/inward/record.url?scp=84899555853&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899555853&partnerID=8YFLogxK

M3 - Conference contribution

VL - 2

SP - 161

EP - 164

BT - Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007

PB - Universidad Nacional Autonoma de Mexico

ER -