Search for ultra-high energy radiation from gamma-ray bursts

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May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...426l...1a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 426, no. 1, p. L1-L3

Mathematics

Probability

21

Astronomical Spectroscopy, Energy Spectra, Gamma Ray Astronomy, Gamma Ray Bursts, Photons, Spaceborne Astronomy, Gamma Ray Observatory, Probability Density Functions

Scientific paper

A recent class of models suggests that some gamma-ray bursters may produce ultra-high-energy (greater than or equal to 100 TeV) photons. Using data from the CYGNUS array, we have searched for evidence of emission of ultra-high-energy radiation coincident with gamma-ray bursts observed either by the third Interplanetary Network of satellites or by the Burst and Transient Source Experiment (BATSE) instrument on the Compton Gamma-Ray Observatory. No statistically significant excess was found for six bursts whose locations were accurately determined by the Network, or for any point in the sky within 2 sigma of the BATSE location coordinates of 52 additional bursts. Flux upper limits depend greatly on the zenith angles of the bursts, but typical limits above 100 TeV are approximately 4 x 10-10/sq cm(s). The flux upper limits for three of the bursts imply that the observed spectrum softens between 2 MeV and approximately 100 TeV. If the production spectrum does not soften between these energies, the bursts must have a cosmological origin.

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