Extragalactic gamma-ray bursts |
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| Institution: | 1. German Aerospace Center, Institute of Aerospace Medicine, Linder Höhe, 51147, Cologne, Germany;2. Southwest Research Institute, Space Science and Engineering Division, Boulder, USA;3. Institut d''Astrophysique Spatiale, CNRS, Orsay, France;4. Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee, USA;5. Space Radiation Analysis Group, NASA Johnson Space Center, Houston, TX, USA;6. Leidos Exploration and Mission Support, Houston, TX, 77258, USA;7. University of Houston, Houston, TX, USA;8. Institute of Experimental and Applied Physics, Christian-Albrechts-University, Kiel, Germany;9. NASA Langley Research Center, 2 West Reid St., MS 188E, Hampton, VA, 23681, USA |
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| Abstract: | Several lines of evidence (the log N(>S)-log S curve and the spatial distribution of bursts) suggest that gamma-ray bursters may reside in an extended halo population, at distances of about 100 kpc from the Earth. Several recent models (e.g. the thermal synchrotron model and the extinct radio pulsar model) arrive at the same conclusion. We point out here that if bursters are indeed quite distant, then it may be possible to detect extragalactic GRB's under some conditions. Using simple scaling arguments, we calculate burst rates and intensities in two nearby galaxies, LMC and M31, and show that a variety of presently operational or planned experiments have sufficient sensitivity to detect extragalactic bursts. Even non-detection can be used to set interesting upper limits to the burster distance scale. |
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