The region of the LMC containing SN 1987A was observed during a balloon flight of a hard-X-ray telescope on April 8-10, 1988. Significant continuum emission was detected in the 45-400-keV range and attributed to SN 1987A. Compared to an observation with the same instrument in October 1987, the source intensity decreased by about 50 percent, while the spectral shape remained qualitatively the same. This may represent the first clear indication that the hard-X-ray emission is entering the declining phase expected as the ejecta become optically thin to the Co-56 gamma rays.
Balloon-borne hard X-ray observations of SN 1987A
Advances in Space Research ; 10 , 2, 19
1990-01-01
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Balloon-borne hard x-ray observations of SN 1987A
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