A Search for Short Duration Bursts of Gamma Rays above 10$^{14}$ eV using CASA-MIA

Session 10 -- Gamma Ray Sources
Display presentation, Monday, 30, 1994, 9:20-6:30

[10.04] A Search for Short Duration Bursts of Gamma Rays above 10$^{14}$ eV using CASA-MIA

\newbox\grsign \setbox\grsign=\hbox{$>$} \newdimen\grdimen \grdimen=\ht\grsign \newbox\simlessbox \newbox\simgreatbox \setbox\simgreatbox=\hbox{\raise.5ex\hbox{$>$} \llap {\lower.5ex\hbox{$\sim$}}} \ht1=\grdimen\dp1=0pt \setbox\simlessbox=\hbox{\raise.5ex\hbox{$<$} \llap {\lower.5ex\hbox{$\sim$}}} \ht2=\grdimen\dp2=0pt \def\simgreat{\mathrel{\copy\simgreatbox}} \def\simless{\mathrel{\copy\simlessbox}} \newbox\simppropto \setbox\simppropto=\hbox{\raise.5ex\hbox{$\sim$} \llap {\lower.5ex\hbox{$\propto$}}} \ht2=\grdimen\dp2=0pt \def\simpropto{\mathrel{\copy\simppropto}} S.Sampson, A.Borione, C.E.Covault, J.W.Cronin, B.E.Fick, L.F.Fortson, K.G.Gibbs,B.J.Newport, T.A.McKay, R.A.Ong, L.J Rosenberg (EFI,U of Chicago), M.Catanese, K.D.Green, A.Kennedy, J.Matthews, D.Nitz, D.Sinclair, J.C. van der Velde (U of Michigan), D.B.Kieda (U of Utah)

CASA-MIA is a ground based array which detects the air-showers produced by gamma-rays at 100 TeV and above. The array's ability to detect muons allows much of the cosmic-ray background to be discarded. Data from 1990 to 1993 has been used to search for short duration gamma-ray bursts from arbitrary direction. No evidence for 0.035s bursts has been found. This result has been used to set a limit on the rate-density of evaporating primordial black holes. Additional point source searches with longer time windows of 1s, 10s and 100s are also investigated.

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