Detection of pseudo gamma-ray bursts of long duration

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bursts, Gamma Ray Astronomy, Radiation Detectors, Balloon Flight, Cosmic Rays, Cosmic X Rays, Scintillation Counters, Time

Scientific paper

The detection of gamma-ray bursts of duration from 4 sec to over 1 min which are most likely due to phosphorescence within the detector rather than actual cosmic events is reported. The three bursts were detected at different times by only one of two independent hard X-ray detectors based on a NaI (Tl) crystal on board a transatlantic balloon flight acquiring data in two energy channels (20-150 and 150-300 keV) over 60 h of sky observation. The time profiles of the burst-like events are typical of celestial gamma-ray bursts, however their detection by only one of the detectors indicates that the bursts have another origin, possibly the interaction of high-Z, high-energy cosmic rays with a single detector. It is concluded that detections of gamma-ray bursts based only on a rate increase by a single scintillator should always be confirmed by at least one other instrument.

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