X-ray observations of SN1987A with Ginga

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Scientific paper

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Supernovae, X-Ray

Scientific paper

Continuous observations of the Large Magellanic CLoud region made with Ginga since February 25, 1987 revealed the X-rays with unusual energy spectrum from the region of 0.2×0.3 deg2 including the supernova SN1987A. The first detection of a significant X-ray flux from SN1987A was detected about 130 days after its explosion. The energy spectrum shows the presence of unusually hard component above 10-15 keV. The light curve shows the relatively large intensity variations in the low energy band of 5.8-16.1 keV, in contrast to small variations in high energy band of 16.1-27.8 keV. About 320 days after the explosion, the SN1987A showed large increase about factor of 6 in 20 days, and they decayed to the half of the peak flux level in 30 days.

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