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

view Abstract Citations (21) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Search for Ultra--High-Energy Radiation from Gamma-Ray Bursts Alexandreas, D. E. ; Allen, G. E. ; Berley, D. ; Biller, S. ; Burman, R. L. ; Cavalli-Sforza, M. ; Chang, C. Y. ; Chen, M. L. ; Chumney, P. ; Coyne, D. ; Dion, C. ; Dion, G. M. ; Dorfan, D. ; Ellsworth, R. W. ; Goodman, J. A. ; Haines, T. J. ; Harmon, M. ; Hoffman, C. M. ; Kelley, L. ; Klein, S. ; Nagle, D. E. ; Schaller, S. C. ; Schmidt, D. M. ; Schnee, R. ; Shoup, A. ; Sinnis, C. ; Stark, M. J. ; Weeks, D. D. ; Williams, D. A. ; Wu, J. -P. ; Yang, T. ; Yodh, G. B. ; Zhang, W. Abstract A recent class of models suggests that some gamma-ray bursters may produce ultra-high-energy (>~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 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 σ 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 ~4 x 10^-10^ cm^-2^ s^-1^. The flux upper limits for three of the bursts imply that the observed spectrum softens between 2 MeV and ~100 TeV: If the production spectrum does not soften between these energies, the bursts must have a cosmological origin. Publication: The Astrophysical Journal Pub Date: May 1994 DOI: 10.1086/187325 Bibcode: 1994ApJ...426L...1A Keywords: Astronomical Spectroscopy; Energy Spectra; Gamma Ray Astronomy; Gamma Ray Bursts; Photons; Spaceborne Astronomy; Gamma Ray Observatory; Probability Density Functions; Astronomy; GAMMA RAYS: BURSTS; GAMMA RAYS: OBSERVATIONS full text sources ADS | data products SIMBAD (11) NED (11) HEASARC (1)