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arxiv astro-ph/0004379 v4 pith:GCDQUQHI submitted 2000-04-27 astro-ph

A Search for Sub-TeV Gammas in Coincidence with Gamma Ray Bursts

classification astro-ph
keywords gammasignificantbatsecoincidenceeventexcessfluencegammas
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on a study of sub-TeV ($E_\gamma > 10$ GeV) gamma-ray-induced muon secondaries in coincidence with BATSE gamma ray bursts (GRBs). Each TeV gamma ray striking the atmosphere produces $\approx$0.2 muons whose identity and angle can be measured by the Project GRAND array. Eight GRB candidates were studied; seven were selected based upon the optimum product of (detected BATSE fluence) $\times$ (GRAND's acceptance). One candidate was added because it was reported as a detection by the Milagrito collaboration. Seven candidates show a positive, though not statistically significant, muon excess. The most significant possible coincidence shows an excess of $466 \pm 171$ muons during the BATSE T90 time interval. It is also of interest that the event with the second most significant signal to noise (1.2$\sigma$) is the Milagrito event. If our most significant event is real, the implied fluence of energetic ($> 10$ GeV) gammas necessary to account for the observed muon excess would require that most of the GRB fluence arrived in the form of energetic gammas.

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