Abstract
Two wide-angle photomultiplier systems were simultaneously operated over a baseline of nearly 30 km in a search for cosmic optical bursts of fractional microsecond time-scale. In 74 hours of overlapping observation, one event was recorded coincident to 1 ms as against the corresponding accidental coincidence value of 0.14 from Čerenkov light pulses from unrelated cosmic ray showers. The possible cosmic origin of this event, including that from primordial black-hole explosions, is discussed and the corresponding upper limits derived.
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Bhat, C.L., Razdan, H. & Sapru, M.L. A new upper limit on optical bursts from primordial black hole explosions. Astrophys Space Sci 73, 513–516 (1980). https://doi.org/10.1007/BF00642429
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DOI: https://doi.org/10.1007/BF00642429