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Related Experiment Videos

Evidence for TeV Emission from GRB 970417a.

Atkins, Benbow, Berley

    The Astrophysical Journal
    |April 19, 2000
    PubMed
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    TeV Observations of Markarian 501 with the Milagrito Water Cerenkov Detector.

    The Astrophysical journal·1999

    Milagrito detected a potential very high energy gamma-ray signal from a gamma-ray burst (GRB) event, GRB 970417a. While other GRBs showed no significant signals, this finding warrants further investigation into TeV gamma-ray bursts.

    Area of Science:

    • High-energy astrophysics
    • Gamma-ray astronomy
    • Cosmic ray physics

    Background:

    • The Milagrito detector observed the northern sky for very high energy gamma rays.
    • Gamma-ray bursts (GRBs) are intense, brief flashes of gamma radiation from space.
    • Searching for TeV gamma-ray counterparts to GRBs is crucial for understanding their emission mechanisms.

    Purpose of the Study:

    • To search for TeV gamma-ray counterparts to GRBs detected by the Burst and Transient Source Experiment (BATSE).
    • To analyze data from the Milagrito detector for coincident events with observed GRBs.

    Main Methods:

    • Milagrito monitored the northern sky from February 1997 to May 1998.
    • Data analysis focused on identifying excesses of gamma-ray events coincident in time and location with BATSE-detected GRBs.

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  • Statistical methods were used to assess the significance of any observed excesses.

    • Main Results:

    • BATSE detected 54 GRBs within Milagrito's field of view during the observation period.
    • A statistically significant excess of events (chance probability 2.8x10^-5) was observed coincident with GRB 970417a.
    • No significant TeV gamma-ray signals were detected from the other 53 GRBs.

    Conclusions:

    • The observed excess from GRB 970417a suggests a potential TeV counterpart, requiring further study.
    • The lack of significant signals from other GRBs provides constraints on TeV emission from these events.
    • This study highlights the capability of ground-based detectors in searching for transient high-energy phenomena.