γ-ray burst observed at balloon altitude

Some balloon observations are reported using a rotating cross-modulation collimator. These resulted in the finding of a small gamma ray burst during about 150 hours of observations and determination of its celestial position with a precision of about 0.30. This appears to be the first precise location of such a burst using a single experimental device; the celestial positions of these bursts have previously been determined through the method of time of flight among two or more satellites. (UK)