The Solar Mass Ejection Imager ( SMEI ) views nearly every point on the sky once every 102 minutes and can detect point sources as faint as R ~ 10 mag. Therefore, SMEI can detect or provide upper limits for the optical afterglow from gamma-ray bursts in the tens of minutes after the burst, when different shocked regions may emit optically. Here we provide upper limits for 58 bursts between 2003 February and 2005 April.
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Buffington et al. (2006) studied this question.
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