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V. Tilvi, D. Cordell, M. Merlo, W. Pereira, V. Muzzin, L. Shamir, R. J. Nemiroff (Michigan Tech.), Night Sky Live Collaboration
Observations of optical counterparts to gamma-ray bursts (GRBs) usually start after a satellite-specific GRB trigger time and are known as optical afterglows. The satellite trigger time may occur well after the arrival time of a bright precursor, however, or even well after a main explosion was visible. The continuous nature of the Night Sky Live (NSL) global network of optical fisheye CONCAMs allows a search of the night sky at times before a GRB trigger. Such emission is referred to here as beforeglow. Reported here is a search for optical beforeglows in NSL data to magnitudes as dim as visual magnitude five for several hours before the GCN-recorded trigger times of HETE, Swift, and the IPN.
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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.